Number: Improve ES6 compatibility

[ChangeLog][QtQml] Number now contains the MAX_SAFE_INTEGER,
MIN_SAFE_INTEGER, isInteger and isSafeInteger properties from the ES6
specification.

All tests for the new functionality pass, except those that require
missing features (like Symbol).

While we're here, also fix up the length attributes of a few methods
(that test262 for ES6 checks).

Remaining failures in Number are now down to:
* Missing binary literal support
* Missing octal literal support
* missing Symbol support

... and there are still some "suspect" failures that may require
behavior changes in:

* toExponential
* toPrecision

Change-Id: I6c9418d2ff94929f5c96d63dde2faa316672e82b
Reviewed-by: Lars Knoll <lars.knoll@qt.io>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/qml/jsruntime/qv4numberobject_p.h b/src/qml/jsruntime/qv4numberobject_p.h
index 364b866a16..e18267c50c 100644
--- a/src/qml/jsruntime/qv4numberobject_p.h
+++ b/src/qml/jsruntime/qv4numberobject_p.h
@@ -88,6 +88,8 @@ struct NumberPrototype: NumberObject
     void init(ExecutionEngine *engine, Object *ctor);
 
     static void method_isFinite(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static void method_isInteger(const BuiltinFunction *, Scope &scope, CallData *callData);
+    static void method_isSafeInteger(const BuiltinFunction *, Scope &scope, CallData *callData);
     static void method_isNaN(const BuiltinFunction *, Scope &scope, CallData *callData);
     static void method_toString(const BuiltinFunction *, Scope &scope, CallData *callData);
     static void method_toLocaleString(const BuiltinFunction *, Scope &scope, CallData *callData);