diff --git a/java/src/com/android/inputmethod/dictionarypack/LocaleUtils.java b/java/src/com/android/inputmethod/dictionarypack/LocaleUtils.java
index d0e8446..77f67b8 100644
--- a/java/src/com/android/inputmethod/dictionarypack/LocaleUtils.java
+++ b/java/src/com/android/inputmethod/dictionarypack/LocaleUtils.java
@@ -144,7 +144,7 @@
     public static String getMatchLevelSortedString(final int matchLevel) {
         // This works because the match levels are 0~99 (actually 0~30)
         // Ideally this should use a number of digits equals to the 1og10 of the greater matchLevel
-        return String.format("%02d", MATCH_LEVEL_MAX - matchLevel);
+        return String.format(Locale.ROOT, "%02d", MATCH_LEVEL_MAX - matchLevel);
     }
 
     /**
diff --git a/java/src/com/android/inputmethod/keyboard/Key.java b/java/src/com/android/inputmethod/keyboard/Key.java
index 1550e77..ae72b4a 100644
--- a/java/src/com/android/inputmethod/keyboard/Key.java
+++ b/java/src/com/android/inputmethod/keyboard/Key.java
@@ -453,7 +453,7 @@
         } else {
             label = "/" + mLabel;
         }
-        return String.format("%s%s %d,%d %dx%d %s/%s/%s",
+        return String.format(Locale.ROOT, "%s%s %d,%d %dx%d %s/%s/%s",
                 Constants.printableCode(mCode), label, mX, mY, mWidth, mHeight, mHintLabel,
                 KeyboardIconsSet.getIconName(mIconId), backgroundName(mBackgroundType));
     }
diff --git a/java/src/com/android/inputmethod/keyboard/KeyboardId.java b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
index aa27067..4c5dd25 100644
--- a/java/src/com/android/inputmethod/keyboard/KeyboardId.java
+++ b/java/src/com/android/inputmethod/keyboard/KeyboardId.java
@@ -187,7 +187,7 @@
     public String toString() {
         final String orientation = (mOrientation == Configuration.ORIENTATION_PORTRAIT)
                 ? "port" : "land";
-        return String.format("[%s %s:%s %s:%dx%d %s %s %s%s%s%s%s%s%s%s%s]",
+        return String.format(Locale.ROOT, "[%s %s:%s %s:%dx%d %s %s %s%s%s%s%s%s%s%s%s]",
                 elementIdToName(mElementId),
                 mLocale,
                 mSubtype.getExtraValueOf(KEYBOARD_LAYOUT_SET),
diff --git a/java/src/com/android/inputmethod/latin/AutoCorrection.java b/java/src/com/android/inputmethod/latin/AutoCorrection.java
index fa35922..86be429 100644
--- a/java/src/com/android/inputmethod/latin/AutoCorrection.java
+++ b/java/src/com/android/inputmethod/latin/AutoCorrection.java
@@ -32,12 +32,13 @@
         // Purely static class: can't instantiate.
     }
 
-    public static boolean isValidWord(final ConcurrentHashMap<String, Dictionary> dictionaries,
-            final String word, final boolean ignoreCase) {
+    public static boolean isValidWord(final Suggest suggest, final String word,
+            final boolean ignoreCase) {
         if (TextUtils.isEmpty(word)) {
             return false;
         }
-        final String lowerCasedWord = word.toLowerCase();
+        final ConcurrentHashMap<String, Dictionary> dictionaries = suggest.getUnigramDictionaries();
+        final String lowerCasedWord = word.toLowerCase(suggest.mLocale);
         for (final String key : dictionaries.keySet()) {
             final Dictionary dictionary = dictionaries.get(key);
             // It's unclear how realistically 'dictionary' can be null, but the monkey is somehow
@@ -73,13 +74,6 @@
         return maxFreq;
     }
 
-    // Returns true if this is in any of the dictionaries.
-    public static boolean isInTheDictionary(
-            final ConcurrentHashMap<String, Dictionary> dictionaries,
-            final String word, final boolean ignoreCase) {
-        return isValidWord(dictionaries, word, ignoreCase);
-    }
-
     public static boolean suggestionExceedsAutoCorrectionThreshold(
             final SuggestedWordInfo suggestion, final String consideredWord,
             final float autoCorrectionThreshold) {
diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index 4fc1919..c644a77 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -45,7 +45,7 @@
     private final int[] mOutputScores = new int[MAX_RESULTS];
     private final int[] mOutputTypes = new int[MAX_RESULTS];
 
-    private final boolean mUseFullEditDistance;
+    private final NativeSuggestOptions mNativeSuggestOptions = new NativeSuggestOptions();
 
     private final SparseArray<DicTraverseSession> mDicTraverseSessions =
             CollectionUtils.newSparseArray();
@@ -79,7 +79,7 @@
             final boolean useFullEditDistance, final Locale locale, final String dictType) {
         super(dictType);
         mLocale = locale;
-        mUseFullEditDistance = useFullEditDistance;
+        mNativeSuggestOptions.setUseFullEditDistance(useFullEditDistance);
         loadDictionary(filename, offset, length);
     }
 
@@ -94,7 +94,7 @@
     private static native int getSuggestionsNative(long dict, long proximityInfo,
             long traverseSession, int[] xCoordinates, int[] yCoordinates, int[] times,
             int[] pointerIds, int[] inputCodePoints, int inputSize, int commitPoint,
-            boolean isGesture, int[] prevWordCodePointArray, boolean useFullEditDistance,
+            int[] suggestOptions, int[] prevWordCodePointArray,
             int[] outputCodePoints, int[] outputScores, int[] outputIndices, int[] outputTypes);
     private static native float calcNormalizedScoreNative(int[] before, int[] after, int score);
     private static native int editDistanceNative(int[] before, int[] after);
@@ -135,12 +135,13 @@
 
         final InputPointers ips = composer.getInputPointers();
         final int inputSize = isGesture ? ips.getPointerSize() : composerSize;
+        mNativeSuggestOptions.setIsGesture(isGesture);
         // proximityInfo and/or prevWordForBigrams may not be null.
         final int count = getSuggestionsNative(mNativeDict, proximityInfo.getNativeProximityInfo(),
                 getTraverseSession(sessionId).getSession(), ips.getXCoordinates(),
                 ips.getYCoordinates(), ips.getTimes(), ips.getPointerIds(), mInputCodePoints,
-                inputSize, 0 /* commitPoint */, isGesture, prevWordCodePointArray,
-                mUseFullEditDistance, mOutputCodePoints, mOutputScores, mSpaceIndices,
+                inputSize, 0 /* commitPoint */, mNativeSuggestOptions.getOptions(),
+                prevWordCodePointArray, mOutputCodePoints, mOutputScores, mSpaceIndices,
                 mOutputTypes);
         final ArrayList<SuggestedWordInfo> suggestions = CollectionUtils.newArrayList();
         for (int j = 0; j < count; ++j) {
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 6bf9f3a..592db35 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -2371,7 +2371,7 @@
         final boolean showingAddToDictionaryHint =
                 SuggestedWordInfo.KIND_TYPED == suggestionInfo.mKind && mSuggest != null
                 // If the suggestion is not in the dictionary, the hint should be shown.
-                && !AutoCorrection.isValidWord(mSuggest.getUnigramDictionaries(), suggestion, true);
+                && !AutoCorrection.isValidWord(mSuggest, suggestion, true);
 
         if (mSettings.isInternal()) {
             Stats.onSeparator((char)Constants.CODE_SPACE,
diff --git a/java/src/com/android/inputmethod/latin/LocaleUtils.java b/java/src/com/android/inputmethod/latin/LocaleUtils.java
index 5fde815..a1e4050 100644
--- a/java/src/com/android/inputmethod/latin/LocaleUtils.java
+++ b/java/src/com/android/inputmethod/latin/LocaleUtils.java
@@ -148,7 +148,7 @@
     public static String getMatchLevelSortedString(int matchLevel) {
         // This works because the match levels are 0~99 (actually 0~30)
         // Ideally this should use a number of digits equals to the 1og10 of the greater matchLevel
-        return String.format("%02d", MATCH_LEVEL_MAX - matchLevel);
+        return String.format(Locale.ROOT, "%02d", MATCH_LEVEL_MAX - matchLevel);
     }
 
     /**
diff --git a/java/src/com/android/inputmethod/latin/NativeSuggestOptions.java b/java/src/com/android/inputmethod/latin/NativeSuggestOptions.java
new file mode 100644
index 0000000..4425f07
--- /dev/null
+++ b/java/src/com/android/inputmethod/latin/NativeSuggestOptions.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.inputmethod.latin;
+
+public class NativeSuggestOptions {
+    // Need to update suggest_options.h when you add, remove or reorder options.
+    private static final int IS_GESTURE = 0;
+    private static final int USE_FULL_EDIT_DISTANCE = 1;
+    private static final int OPTIONS_SIZE = 2;
+
+    private final int[] mOptions = new int[OPTIONS_SIZE];
+
+    public void setIsGesture(final boolean value) {
+        setBooleanOption(IS_GESTURE, value);
+    }
+
+    public void setUseFullEditDistance(final boolean value) {
+        setBooleanOption(USE_FULL_EDIT_DISTANCE, value);
+    }
+
+    public int[] getOptions() {
+        return mOptions;
+    }
+
+    private void setBooleanOption(final int key, final boolean value) {
+        mOptions[key] = value ? 1 : 0;
+    }
+}
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index dc9bef2..5d580f2 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -229,7 +229,7 @@
         // or if it's a 2+ characters non-word (i.e. it's not in the dictionary).
         final boolean allowsToBeAutoCorrected = (null != whitelistedWord
                 && !whitelistedWord.equals(consideredWord))
-                || (consideredWord.length() > 1 && !AutoCorrection.isInTheDictionary(mDictionaries,
+                || (consideredWord.length() > 1 && !AutoCorrection.isValidWord(this,
                         consideredWord, wordComposer.isFirstCharCapitalized()));
 
         final boolean hasAutoCorrection;
@@ -379,7 +379,8 @@
                     typedWord, cur.toString(), cur.mScore);
             final String scoreInfoString;
             if (normalizedScore > 0) {
-                scoreInfoString = String.format("%d (%4.2f)", cur.mScore, normalizedScore);
+                scoreInfoString = String.format(
+                        Locale.ROOT, "%d (%4.2f)", cur.mScore, normalizedScore);
             } else {
                 scoreInfoString = Integer.toString(cur.mScore);
             }
diff --git a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
index 1dd68ea..0e9c292 100644
--- a/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
+++ b/native/jni/com_android_inputmethod_latin_BinaryDictionary.cpp
@@ -35,6 +35,7 @@
 #include "dictionary.h"
 #include "jni.h"
 #include "jni_common.h"
+#include "suggest_options.h"
 
 namespace latinime {
 
@@ -128,10 +129,9 @@
 static int latinime_BinaryDictionary_getSuggestions(JNIEnv *env, jclass clazz, jlong dict,
         jlong proximityInfo, jlong dicTraverseSession, jintArray xCoordinatesArray,
         jintArray yCoordinatesArray, jintArray timesArray, jintArray pointerIdsArray,
-        jintArray inputCodePointsArray, jint inputSize, jint commitPoint, jboolean isGesture,
-        jintArray prevWordCodePointsForBigrams, jboolean useFullEditDistance,
-        jintArray outputCodePointsArray, jintArray scoresArray, jintArray spaceIndicesArray,
-        jintArray outputTypesArray) {
+        jintArray inputCodePointsArray, jint inputSize, jint commitPoint, jintArray suggestOptions,
+        jintArray prevWordCodePointsForBigrams, jintArray outputCodePointsArray,
+        jintArray scoresArray, jintArray spaceIndicesArray, jintArray outputTypesArray) {
     Dictionary *dictionary = reinterpret_cast<Dictionary *>(dict);
     if (!dictionary) return 0;
     ProximityInfo *pInfo = reinterpret_cast<ProximityInfo *>(proximityInfo);
@@ -159,6 +159,11 @@
         prevWordCodePoints = prevWordCodePointsInternal;
     }
 
+    const jsize numberOfOptions = env->GetArrayLength(suggestOptions);
+    int options[numberOfOptions];
+    env->GetIntArrayRegion(suggestOptions, 0, numberOfOptions, options);
+    SuggestOptions givenOptions(options, numberOfOptions);
+
     // Output values
     /* By the way, let's check the output array length here to make sure */
     const jsize outputCodePointsLength = env->GetArrayLength(outputCodePointsArray);
@@ -185,11 +190,12 @@
     memset(outputTypes, 0, sizeof(outputTypes));
 
     int count;
-    if (isGesture || inputSize > 0) {
+    if (givenOptions.isGesture() || inputSize > 0) {
         count = dictionary->getSuggestions(pInfo, traverseSession, xCoordinates, yCoordinates,
                 times, pointerIds, inputCodePoints, inputSize, prevWordCodePoints,
-                prevWordCodePointsLength, commitPoint, isGesture, useFullEditDistance,
-                outputCodePoints, scores, spaceIndices, outputTypes);
+                prevWordCodePointsLength, commitPoint, givenOptions.isGesture(),
+                givenOptions.useFullEditDistance(), outputCodePoints, scores,
+                spaceIndices, outputTypes);
     } else {
         count = dictionary->getBigrams(prevWordCodePoints, prevWordCodePointsLength,
                 inputCodePoints, inputSize, outputCodePoints, scores, outputTypes);
@@ -288,7 +294,7 @@
      const_cast<char *>("(J)V"),
      reinterpret_cast<void *>(latinime_BinaryDictionary_close)},
     {const_cast<char *>("getSuggestionsNative"),
-     const_cast<char *>("(JJJ[I[I[I[I[IIIZ[IZ[I[I[I[I)I"),
+     const_cast<char *>("(JJJ[I[I[I[I[III[I[I[I[I[I[I)I"),
      reinterpret_cast<void *>(latinime_BinaryDictionary_getSuggestions)},
     {const_cast<char *>("getProbabilityNative"),
      const_cast<char *>("(J[I)I"),
diff --git a/native/jni/src/suggest_options.h b/native/jni/src/suggest_options.h
new file mode 100644
index 0000000..1bed47c
--- /dev/null
+++ b/native/jni/src/suggest_options.h
@@ -0,0 +1,65 @@
+/*
+ * Copyright (C) 2013 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef LATINIME_SUGGEST_OPTIONS_H
+#define LATINIME_SUGGEST_OPTIONS_H
+
+#include "defines.h"
+
+namespace latinime {
+
+class SuggestOptions{
+ public:
+    AK_FORCE_INLINE bool isGesture() const {
+        return getBoolOption(IS_GESTURE);
+    }
+
+    AK_FORCE_INLINE bool useFullEditDistance() const {
+        return getBoolOption(USE_FULL_EDIT_DISTANCE);
+    }
+
+    SuggestOptions(const int *const options, const int length)
+            : mOptions(options), mLength(length) {}
+
+ private:
+    // Need to update com.android.inputmethod.latin.NativeSuggestOptions when you add, remove or
+    // reorder options.
+    static const int IS_GESTURE = 0;
+    static const int USE_FULL_EDIT_DISTANCE = 1;
+
+    const int *const mOptions;
+    const int mLength;
+
+    AK_FORCE_INLINE bool isValidKey(const int key) const {
+        return 0 <= key && key < mLength;
+    }
+
+    AK_FORCE_INLINE bool getBoolOption(const int key) const {
+        if (isValidKey(key)) {
+            return mOptions[key] != 0;
+        }
+        return false;
+    }
+
+    AK_FORCE_INLINE int getIntOption(const int key) const {
+        if (isValidKey(key)) {
+            return mOptions[key];
+        }
+        return 0;
+    }
+};
+} // namespace latinime
+#endif // LATINIME_SUGGEST_OPTIONS_H
diff --git a/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserTests.java b/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserTests.java
index b1ae6f5..861abe8 100644
--- a/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserTests.java
+++ b/tests/src/com/android/inputmethod/keyboard/internal/KeySpecParserTests.java
@@ -35,8 +35,8 @@
 
     private static final String CODE_SETTINGS = "!code/key_settings";
     private static final String ICON_SETTINGS = "!icon/settings_key";
-    private static final String CODE_SETTINGS_UPPERCASE = CODE_SETTINGS.toUpperCase();
-    private static final String ICON_SETTINGS_UPPERCASE = ICON_SETTINGS.toUpperCase();
+    private static final String CODE_SETTINGS_UPPERCASE = CODE_SETTINGS.toUpperCase(Locale.ROOT);
+    private static final String ICON_SETTINGS_UPPERCASE = ICON_SETTINGS.toUpperCase(Locale.ROOT);
     private static final String CODE_NON_EXISTING = "!code/non_existing";
     private static final String ICON_NON_EXISTING = "!icon/non_existing";
 
@@ -587,7 +587,7 @@
                 new String[] { null, "a", "b", "c" }, true);
         // Upper case specification will not work.
         assertGetBooleanValue("HAS LABEL", HAS_LABEL,
-                new String[] { HAS_LABEL.toUpperCase(), "a", "b", "c" },
+                new String[] { HAS_LABEL.toUpperCase(Locale.ROOT), "a", "b", "c" },
                 new String[] { "!HASLABEL!", "a", "b", "c" }, false);
 
         assertGetBooleanValue("No has label", HAS_LABEL,
@@ -600,13 +600,13 @@
         // Upper case specification will not work.
         assertGetBooleanValue("Multiple has label", HAS_LABEL,
                 new String[] {
-                    "a", HAS_LABEL.toUpperCase(), "b", "c", HAS_LABEL, "d" },
+                    "a", HAS_LABEL.toUpperCase(Locale.ROOT), "b", "c", HAS_LABEL, "d" },
                 new String[] {
                     "a", "!HASLABEL!", "b", "c", null, "d" }, true);
         // Upper case specification will not work.
         assertGetBooleanValue("Multiple has label with needs dividers", HAS_LABEL,
                 new String[] {
-                    "a", HAS_LABEL, "b", NEEDS_DIVIDER, HAS_LABEL.toUpperCase(), "d" },
+                    "a", HAS_LABEL, "b", NEEDS_DIVIDER, HAS_LABEL.toUpperCase(Locale.ROOT), "d" },
                 new String[] {
                     "a", null, "b", NEEDS_DIVIDER, "!HASLABEL!", "d" }, true);
     }
@@ -625,7 +625,7 @@
                 new String[] { null, "a", "b", "c" }, 3);
         // Upper case specification will not work.
         assertGetIntValue("FIXED COLUMN ORDER 3", FIXED_COLUMN_ORDER, -1,
-                new String[] { FIXED_COLUMN_ORDER.toUpperCase() + "3", "a", "b", "c" },
+                new String[] { FIXED_COLUMN_ORDER.toUpperCase(Locale.ROOT) + "3", "a", "b", "c" },
                 new String[] { "!FIXEDCOLUMNORDER!3", "a", "b", "c" }, -1);
 
         assertGetIntValue("No fixed column order", FIXED_COLUMN_ORDER, -1,
@@ -641,7 +641,7 @@
         // Upper case specification will not work.
         assertGetIntValue("Multiple fixed column order 5,3 with has label", FIXED_COLUMN_ORDER, -1,
                 new String[] {
-                    FIXED_COLUMN_ORDER.toUpperCase() + "5", HAS_LABEL, "a",
+                    FIXED_COLUMN_ORDER.toUpperCase(Locale.ROOT) + "5", HAS_LABEL, "a",
                     FIXED_COLUMN_ORDER + "3", "b" },
                 new String[] { "!FIXEDCOLUMNORDER!5", HAS_LABEL, "a", null, "b" }, 3);
     }