diff --git a/src/evalfunc.c b/src/evalfunc.c
index b96fc47..314a3f8 100644
--- a/src/evalfunc.c
+++ b/src/evalfunc.c
@@ -215,7 +215,7 @@
 	type_T		*actual,
 	argcontext_T	*context)
 {
-    return need_type(actual, expected,
+    return need_type(actual, expected, FALSE,
 	    context->arg_idx - context->arg_count, context->arg_idx + 1,
 	    context->arg_cctx, FALSE, FALSE);
 }
@@ -229,7 +229,7 @@
 	type_T		*actual,
 	argcontext_T	*context)
 {
-    if (need_type(actual, expected,
+    if (need_type(actual, expected, FALSE,
 	    context->arg_idx - context->arg_count, context->arg_idx + 1,
 	    context->arg_cctx, FALSE, FALSE) == FAIL)
 	return FAIL;
diff --git a/src/proto/vim9compile.pro b/src/proto/vim9compile.pro
index 13b96c2..9f2263a 100644
--- a/src/proto/vim9compile.pro
+++ b/src/proto/vim9compile.pro
@@ -5,9 +5,9 @@
 int script_is_vim9(void);
 int script_var_exists(char_u *name, size_t len, cctx_T *cctx, cstack_T *cstack);
 int check_defined(char_u *p, size_t len, cctx_T *cctx, cstack_T *cstack, int is_arg);
-int need_type_where(type_T *actual, type_T *expected, int offset, where_T where, cctx_T *cctx, int silent, int actual_is_const);
-int need_type(type_T *actual, type_T *expected, int offset, int arg_idx, cctx_T *cctx, int silent, int actual_is_const);
-lvar_T *reserve_local(cctx_T *cctx, char_u *name, size_t len, int isConst, type_T *type);
+int need_type_where(type_T *actual, type_T *expected, int number_ok, int offset, where_T where, cctx_T *cctx, int silent, int actual_is_const);
+int need_type(type_T *actual, type_T *expected, int number_ok, int offset, int arg_idx, cctx_T *cctx, int silent, int actual_is_const);
+lvar_T *reserve_local(cctx_T *cctx, char_u *name, size_t len, int assign, type_T *type);
 int get_script_item_idx(int sid, char_u *name, int check_writable, cctx_T *cctx, cstack_T *cstack);
 imported_T *find_imported(char_u *name, size_t len, int load);
 char_u *may_peek_next_line(cctx_T *cctx, char_u *arg, char_u **nextp);
diff --git a/src/proto/vim9instr.pro b/src/proto/vim9instr.pro
index c242148..e92fe10 100644
--- a/src/proto/vim9instr.pro
+++ b/src/proto/vim9instr.pro
@@ -15,7 +15,7 @@
 int generate_CONCAT(cctx_T *cctx, int count);
 int generate_2BOOL(cctx_T *cctx, int invert, int offset);
 int generate_COND2BOOL(cctx_T *cctx);
-int generate_TYPECHECK(cctx_T *cctx, type_T *expected, int offset, int is_var, int argidx);
+int generate_TYPECHECK(cctx_T *cctx, type_T *expected, int number_ok, int offset, int is_var, int argidx);
 int generate_SETTYPE(cctx_T *cctx, type_T *expected);
 int generate_tv_PUSH(cctx_T *cctx, typval_T *tv);
 int generate_PUSHNR(cctx_T *cctx, varnumber_T number);
diff --git a/src/structs.h b/src/structs.h
index f4bd386..45c8211 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -1460,6 +1460,12 @@
     type_T	*type_decl;	    // declared type or equal to type_current
 } type2_T;
 
+#define TTFLAG_VARARGS	    0x01    // func args ends with "..."
+#define TTFLAG_BOOL_OK	    0x02    // can be converted to bool
+#define TTFLAG_NUMBER_OK    0x04    // tt_type is VAR_FLOAT, VAR_NUMBER is OK
+#define TTFLAG_STATIC	    0x08    // one of the static types, e.g. t_any
+#define TTFLAG_CONST	    0x10    // cannot be changed
+
 typedef enum {
     ACCESS_PRIVATE,	// read/write only inside th class
     ACCESS_READ,	// read everywhere, write only inside th class
@@ -1517,11 +1523,6 @@
     int		obj_copyID;	    // used by garbage collection
 };
 
-#define TTFLAG_VARARGS	0x01	    // func args ends with "..."
-#define TTFLAG_BOOL_OK	0x02	    // can be converted to bool
-#define TTFLAG_STATIC	0x04	    // one of the static types, e.g. t_any
-#define TTFLAG_CONST	0x08	    // cannot be changed
-
 /*
  * Structure to hold an internal variable without a name.
  */
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 2c67103..6354782 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -2033,6 +2033,34 @@
   v9.CheckScriptFailure(['vim9script', "var x = <number>"], 'E15:', 2)
   v9.CheckDefAndScriptFailure(["var x = <number >123"], 'E1068:', 1)
   v9.CheckDefAndScriptFailure(["var x = <number 123"], 'E1104:', 1)
+
+  lines =<< trim END
+      vim9script
+
+      def Sum(v: any): float
+        var sum = 0.0
+        sum += v
+        return sum
+      enddef
+
+      const kk = 1
+      echo Sum(kk)
+  END
+  v9.CheckScriptSuccess(lines)
+
+  lines =<< trim END
+      vim9script
+
+      def Sum(v: any): float
+        var sum = 0.0
+        sum += <float>v
+        return sum
+      enddef
+
+      const kk = 1
+      Sum(kk)
+  END
+  v9.CheckScriptFailure(lines, 'E1012: Type mismatch; expected float but got number')
 enddef
 
 " test low level expression
diff --git a/src/version.c b/src/version.c
index 029652e..d2e01fe 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1108,
+/**/
     1107,
 /**/
     1106,
diff --git a/src/vim9cmds.c b/src/vim9cmds.c
index 5aa783e..ed6311b 100644
--- a/src/vim9cmds.c
+++ b/src/vim9cmds.c
@@ -1045,7 +1045,7 @@
 		if (lhs_type == &t_any)
 		    lhs_type = item_type;
 		else if (item_type != &t_unknown
-			&& need_type_where(item_type, lhs_type, -1,
+			&& need_type_where(item_type, lhs_type, FALSE, -1,
 					    where, cctx, FALSE, FALSE) == FAIL)
 		    goto failed;
 		var_lvar = reserve_local(cctx, arg, varlen, ASSIGN_FINAL,
@@ -2469,7 +2469,7 @@
 	if (compile_assign_lhs(arg, lhs, CMD_redir,
 					 FALSE, FALSE, FALSE, 1, cctx) == FAIL)
 	    return NULL;
-	if (need_type(&t_string, lhs->lhs_member_type,
+	if (need_type(&t_string, lhs->lhs_member_type, FALSE,
 					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 	    return NULL;
 	if (cctx->ctx_skip == SKIP_YES)
@@ -2551,7 +2551,7 @@
 	    int save_flags = cmdmod.cmod_flags;
 
 	    generate_LEGACY_EVAL(cctx, p);
-	    if (need_type(&t_any, cctx->ctx_ufunc->uf_ret_type, -1,
+	    if (need_type(&t_any, cctx->ctx_ufunc->uf_ret_type, FALSE, -1,
 						0, cctx, FALSE, FALSE) == FAIL)
 		return NULL;
 	    cmdmod.cmod_flags |= CMOD_LEGACY;
@@ -2580,8 +2580,8 @@
 	    }
 	    else
 	    {
-		if (need_type(stack_type, cctx->ctx_ufunc->uf_ret_type, -1,
-						0, cctx, FALSE, FALSE) == FAIL)
+		if (need_type(stack_type, cctx->ctx_ufunc->uf_ret_type, FALSE,
+					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 		    return NULL;
 	    }
 	}
diff --git a/src/vim9compile.c b/src/vim9compile.c
index 9105dcf..0d980ba 100644
--- a/src/vim9compile.c
+++ b/src/vim9compile.c
@@ -451,6 +451,7 @@
 need_type_where(
 	type_T	*actual,
 	type_T	*expected,
+	int	number_ok,	// expect VAR_FLOAT but VAR_NUMBER is OK
 	int	offset,
 	where_T	where,
 	cctx_T	*cctx,
@@ -480,7 +481,7 @@
     // If the actual type can be the expected type add a runtime check.
     if (!actual_is_const && ret == MAYBE && use_typecheck(actual, expected))
     {
-	generate_TYPECHECK(cctx, expected, offset,
+	generate_TYPECHECK(cctx, expected, number_ok, offset,
 					    where.wt_variable, where.wt_index);
 	return OK;
     }
@@ -494,6 +495,7 @@
 need_type(
 	type_T	*actual,
 	type_T	*expected,
+	int	number_ok,  // when expected is float number is also OK
 	int	offset,
 	int	arg_idx,
 	cctx_T	*cctx,
@@ -503,7 +505,7 @@
     where_T where = WHERE_INIT;
 
     where.wt_index = arg_idx;
-    return need_type_where(actual, expected, offset, where,
+    return need_type_where(actual, expected, number_ok, offset, where,
 						cctx, silent, actual_is_const);
 }
 
@@ -2000,8 +2002,8 @@
 	// now we can properly check the type
 	if (rhs_type != NULL && lhs->lhs_type->tt_member != NULL
 		&& rhs_type != &t_void
-		&& need_type(rhs_type, lhs->lhs_type->tt_member, -2, 0, cctx,
-							 FALSE, FALSE) == FAIL)
+		&& need_type(rhs_type, lhs->lhs_type->tt_member, FALSE,
+					    -2, 0, cctx, FALSE, FALSE) == FAIL)
 	    return FAIL;
     }
     else
@@ -2090,13 +2092,13 @@
 	    if (range)
 	    {
 		type = get_type_on_stack(cctx, 1);
-		if (need_type(type, &t_number,
+		if (need_type(type, &t_number, FALSE,
 					    -2, 0, cctx, FALSE, FALSE) == FAIL)
 		return FAIL;
 	    }
 	    type = get_type_on_stack(cctx, 0);
 	    if ((dest_type != VAR_BLOB && type->tt_type != VAR_SPECIAL)
-		    && need_type(type, &t_number,
+		    && need_type(type, &t_number, FALSE,
 					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 		return FAIL;
 	}
@@ -2357,7 +2359,7 @@
 		emsg(_(e_cannot_use_void_value));
 		goto theend;
 	    }
-	    if (need_type(stacktype, &t_list_any, -1, 0, cctx,
+	    if (need_type(stacktype, &t_list_any, FALSE, -1, 0, cctx,
 							 FALSE, FALSE) == FAIL)
 		goto theend;
 	    // If a constant list was used we can check the length right here.
@@ -2424,7 +2426,7 @@
 	{
 	    SOURCING_LNUM = start_lnum;
 	    if (lhs.lhs_has_type
-		    && need_type(&t_list_string, lhs.lhs_type,
+		    && need_type(&t_list_string, lhs.lhs_type, FALSE,
 					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 		goto theend;
 	}
@@ -2549,8 +2551,8 @@
 				&& !has_list_index(var_start + lhs.lhs_varlen,
 									 cctx))
 			    use_type = lhs.lhs_member_type;
-			if (need_type_where(rhs_type, use_type, -1, where,
-						cctx, FALSE, is_const) == FAIL)
+			if (need_type_where(rhs_type, use_type, FALSE, -1,
+					 where, cctx, FALSE, is_const) == FAIL)
 			    goto theend;
 		    }
 		}
@@ -2565,7 +2567,7 @@
 				|| lhs_type == &t_float)
 			    && rhs_type->tt_type == VAR_NUMBER)
 			lhs_type = &t_number;
-		    if (*p != '=' && need_type(rhs_type, lhs_type,
+		    if (*p != '=' && need_type(rhs_type, lhs_type, FALSE,
 					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 		    goto theend;
 		}
@@ -2622,8 +2624,8 @@
 		if (
 		    // If variable is float operation with number is OK.
 		    !(expected == &t_float && (stacktype == &t_number
-			    || stacktype == &t_number_bool)) &&
-		    need_type(stacktype, expected, -1, 0, cctx,
+			    || stacktype == &t_number_bool))
+		    && need_type(stacktype, expected, TRUE, -1, 0, cctx,
 							 FALSE, FALSE) == FAIL)
 		    goto theend;
 	    }
@@ -3104,7 +3106,7 @@
 		ufunc->uf_arg_types[arg_idx] = val_type;
 	    }
 	    else if (need_type_where(val_type, ufunc->uf_arg_types[arg_idx],
-				       -1, where, &cctx, FALSE, FALSE) == FAIL)
+				FALSE, -1, where, &cctx, FALSE, FALSE) == FAIL)
 		goto erret;
 
 	    if (generate_STORE(&cctx, ISN_STORE, i - count - off, NULL) == FAIL)
diff --git a/src/vim9execute.c b/src/vim9execute.c
index a6d43b5..06229b8 100644
--- a/src/vim9execute.c
+++ b/src/vim9execute.c
@@ -6872,16 +6872,23 @@
 	    case ISN_CHECKTYPE:
 		  {
 		      checktype_T   *ct = &iptr->isn_arg.type;
-		      char	    *tofree;
+		      char	    *tofree = NULL;
+		      char	    *typename;
+
+		      if (ct->ct_type->tt_type == VAR_FLOAT
+			      && (ct->ct_type->tt_flags & TTFLAG_NUMBER_OK))
+			  typename = "float|number";
+		      else
+			  typename = type_name(ct->ct_type, &tofree);
 
 		      if (ct->ct_arg_idx == 0)
 			  smsg("%s%4d CHECKTYPE %s stack[%d]", pfx, current,
-					  type_name(ct->ct_type, &tofree),
+					  typename,
 					  (int)ct->ct_off);
 		      else
 			  smsg("%s%4d CHECKTYPE %s stack[%d] %s %d",
 					  pfx, current,
-					  type_name(ct->ct_type, &tofree),
+					  typename,
 					  (int)ct->ct_off,
 					  ct->ct_is_var ? "var": "arg",
 					  (int)ct->ct_arg_idx);
diff --git a/src/vim9expr.c b/src/vim9expr.c
index b4e201e..ba2c826 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -99,13 +99,14 @@
 	vartype = VAR_DICT;
     if (vartype == VAR_STRING || vartype == VAR_LIST || vartype == VAR_BLOB)
     {
-	if (need_type(idxtype, &t_number, -1, 0, cctx, FALSE, FALSE) == FAIL)
+	if (need_type(idxtype, &t_number, FALSE,
+					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 	    return FAIL;
 	if (is_slice)
 	{
 	    idxtype = get_type_on_stack(cctx, 1);
-	    if (need_type(idxtype, &t_number, -2, 0, cctx,
-							 FALSE, FALSE) == FAIL)
+	    if (need_type(idxtype, &t_number, FALSE,
+					    -2, 0, cctx, FALSE, FALSE) == FAIL)
 		return FAIL;
 	}
     }
@@ -135,8 +136,8 @@
 	}
 	else
 	{
-	    if (need_type(typep->type_curr, &t_dict_any, -2, 0, cctx,
-							 FALSE, FALSE) == FAIL)
+	    if (need_type(typep->type_curr, &t_dict_any, FALSE,
+					    -2, 0, cctx, FALSE, FALSE) == FAIL)
 		return FAIL;
 	    typep->type_curr = &t_any;
 	    typep->type_decl = &t_any;
@@ -1725,7 +1726,7 @@
 	// This requires a runtime type check.
 	return generate_COND2BOOL(cctx);
 
-    return need_type(type, &t_bool, -1, 0, cctx, FALSE, FALSE);
+    return need_type(type, &t_bool, FALSE, -1, 0, cctx, FALSE, FALSE);
 }
 
 /*
@@ -1759,7 +1760,7 @@
 	{
 	    type_T *type = get_type_on_stack(cctx, 0);
 	    if (type->tt_type != VAR_FLOAT && need_type(type, &t_number,
-					    -1, 0, cctx, FALSE, FALSE) == FAIL)
+				     FALSE, -1, 0, cctx, FALSE, FALSE) == FAIL)
 		return FAIL;
 
 	    // only '-' has an effect, for '+' we only check the type
@@ -2517,8 +2518,8 @@
 	actual = get_type_on_stack(cctx, 0);
 	if (check_type_maybe(want_type, actual, FALSE, where) != OK)
 	{
-	    if (need_type(actual, want_type, -1, 0, cctx, FALSE, FALSE)
-								       == FAIL)
+	    if (need_type(actual, want_type, FALSE,
+					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 		return FAIL;
 	}
     }
@@ -2759,7 +2760,7 @@
 	{
 	    type_T	*t = get_type_on_stack(cctx, 0);
 
-	    if (need_type(t, &t_number, 0, 0, cctx, FALSE, FALSE) == FAIL)
+	    if (need_type(t, &t_number, FALSE, 0, 0, cctx, FALSE, FALSE) == FAIL)
 	    {
 		emsg(_(e_bitshift_ops_must_be_number));
 		return FAIL;
@@ -2814,8 +2815,8 @@
 	}
 	else
 	{
-	    if (need_type(get_type_on_stack(cctx, 0), &t_number, 0, 0, cctx,
-			FALSE, FALSE) == FAIL)
+	    if (need_type(get_type_on_stack(cctx, 0), &t_number, FALSE,
+					     0, 0, cctx, FALSE, FALSE) == FAIL)
 	    {
 		emsg(_(e_bitshift_ops_must_be_number));
 		return FAIL;
diff --git a/src/vim9instr.c b/src/vim9instr.c
index 4a22d18..b4c66e3 100644
--- a/src/vim9instr.c
+++ b/src/vim9instr.c
@@ -576,6 +576,7 @@
 generate_TYPECHECK(
 	cctx_T	    *cctx,
 	type_T	    *expected,
+	int	    number_ok,	    // add TTFLAG_NUMBER_OK flag
 	int	    offset,
 	int	    is_var,
 	int	    argidx)
@@ -585,7 +586,21 @@
     RETURN_OK_IF_SKIP(cctx);
     if ((isn = generate_instr(cctx, ISN_CHECKTYPE)) == NULL)
 	return FAIL;
-    isn->isn_arg.type.ct_type = alloc_type(expected);
+    type_T *tt;
+    if (expected->tt_type == VAR_FLOAT && number_ok)
+    {
+	// always allocate, also for static types
+	tt = ALLOC_ONE(type_T);
+	if (tt != NULL)
+	{
+	    *tt = *expected;
+	    tt->tt_flags |= TTFLAG_NUMBER_OK;
+	}
+    }
+    else
+	tt = alloc_type(expected);
+
+    isn->isn_arg.type.ct_type = tt;
     isn->isn_arg.type.ct_off = (int8_T)offset;
     isn->isn_arg.type.ct_is_var = is_var;
     isn->isn_arg.type.ct_arg_idx = (int8_T)argidx;
@@ -1601,7 +1616,7 @@
     if (maptype != NULL && maptype[0].type_decl->tt_member != NULL
 				  && maptype[0].type_decl->tt_member != &t_any)
 	// Check that map() didn't change the item types.
-	generate_TYPECHECK(cctx, maptype[0].type_decl, -1, FALSE, 1);
+	generate_TYPECHECK(cctx, maptype[0].type_decl, FALSE, -1, FALSE, 1);
 
     return OK;
 }
@@ -1625,7 +1640,7 @@
 	return FAIL;
     item_type = get_type_on_stack(cctx, 0);
     expected = list_type->tt_member;
-    if (need_type(item_type, expected, -1, 0, cctx, FALSE, FALSE) == FAIL)
+    if (need_type(item_type, expected, FALSE, -1, 0, cctx, FALSE, FALSE) == FAIL)
 	return FAIL;
 
     if (generate_instr(cctx, ISN_LISTAPPEND) == NULL)
@@ -1648,7 +1663,8 @@
     if (arg_type_modifiable(get_decl_type_on_stack(cctx, 1), 1) == FAIL)
 	return FAIL;
     item_type = get_type_on_stack(cctx, 0);
-    if (need_type(item_type, &t_number, -1, 0, cctx, FALSE, FALSE) == FAIL)
+    if (need_type(item_type, &t_number, FALSE,
+					    -1, 0, cctx, FALSE, FALSE) == FAIL)
 	return FAIL;
 
     if (generate_instr(cctx, ISN_BLOBAPPEND) == NULL)
@@ -1713,8 +1729,8 @@
 		expected = &t_any;
 	    else
 		expected = ufunc->uf_va_type->tt_member;
-	    if (need_type(actual, expected, -argcount + i, i + 1, cctx,
-							  TRUE, FALSE) == FAIL)
+	    if (need_type(actual, expected, FALSE,
+			      -argcount + i, i + 1, cctx, TRUE, FALSE) == FAIL)
 	    {
 		arg_type_mismatch(expected, actual, i + 1);
 		return FAIL;
@@ -1821,8 +1837,8 @@
 		    expected = &t_any;
 		else
 		    expected = type->tt_args[i];
-		if (need_type(actual, expected, offset, i + 1,
-						    cctx, TRUE, FALSE) == FAIL)
+		if (need_type(actual, expected, FALSE,
+				     offset, i + 1, cctx, TRUE, FALSE) == FAIL)
 		{
 		    arg_type_mismatch(expected, actual, i + 1);
 		    return FAIL;
diff --git a/src/vim9type.c b/src/vim9type.c
index 393c69d..436a42d 100644
--- a/src/vim9type.c
+++ b/src/vim9type.c
@@ -813,6 +813,11 @@
 					&& (actual->tt_flags & TTFLAG_BOOL_OK))
 		// Using number 0 or 1 for bool is OK.
 		return OK;
+	    if (expected->tt_type == VAR_FLOAT
+		    && (expected->tt_flags & TTFLAG_NUMBER_OK)
+					&& actual->tt_type == VAR_NUMBER)
+		// Using number where float is expected is OK here.
+		return OK;
 	    if (give_msg)
 		type_mismatch_where(expected, actual, where);
 	    return FAIL;
@@ -848,7 +853,8 @@
 	    {
 		int i;
 
-		for (i = 0; i < expected->tt_argcount && i < actual->tt_argcount; ++i)
+		for (i = 0; i < expected->tt_argcount
+					       && i < actual->tt_argcount; ++i)
 		    // Allow for using "any" argument type, lambda's have them.
 		    if (actual->tt_args[i] != &t_any && check_type(
 			    expected->tt_args[i], actual->tt_args[i], FALSE,