gistfile1.txt

Object.keys({a:1}) ----------------------
DebugPrint: 0x4c012f99: [JSObject]
 - map = 0x5f30a2e1 [FAST_HOLEY_ELEMENTS]
 - prototype = 0x24976009
 {
   #length: 0x24962489 <ExecutableAccessorInfo> (accessor constant)
   0: 0x2492fdb1 <String[1]: a>
 }

0x5f30a2e1: [Map]
 - type: JS_ARRAY_TYPE
 - instance size: 16
 - inobject properties: 0
 - elements kind: FAST_HOLEY_ELEMENTS
 - unused property fields: 0
 - stable_map
 - back pointer: 0x5f30a2b5 <Map(FAST_ELEMENTS)>
 - instance descriptors (own) #1: 0x249768b5 <FixedArray[5]>
 - prototype: 0x24976009 <JS Array[0]>
 - constructor: 0x24975ee9 <JS Function Array (SharedFunctionInfo 0x249609e9)>
 - code cache: 0x2490809d <FixedArray[0]>
 - dependent code: 0x2490809d <FixedArray[0]>


['a'] -----------------------------------
DebugPrint: 0x4c0133f5: [JSObject]
 - map = 0x5f30a2b5 [FAST_ELEMENTS]
 - prototype = 0x24976009
 {
   #length: 0x24962489 <ExecutableAccessorInfo> (accessor constant)
 - transitions
   "elements_transition_symbol": (transition to FAST_HOLEY_ELEMENTS) -> 0x5f30a2e1 <Map(FAST_HOLEY_ELEMENTS)>
   0: 0x2492fdb1 <String[1]: a>
 }

0x5f30a2b5: [Map]
 - type: JS_ARRAY_TYPE
 - instance size: 16
 - inobject properties: 0
 - elements kind: FAST_ELEMENTS
 - unused property fields: 0
 - back pointer: 0x5f30a289 <Map(FAST_HOLEY_DOUBLE_ELEMENTS)>
 - instance descriptors #1: 0x249768b5 <FixedArray[5]>
 - transitions #1: 0x2497689d <FixedArray[4]>
   "elements_transition_symbol": (transition to FAST_HOLEY_ELEMENTS) -> 0x5f30a2e1 <Map(FAST_HOLEY_ELEMENTS)>
 - prototype: 0x24976009 <JS Array[0]>
 - constructor: 0x24975ee9 <JS Function Array (SharedFunctionInfo 0x249609e9)>
 - code cache: 0x24988309 <CodeCache>
 - dependent code: 0x2490809d <FixedArray[0]>

test.js

//print(%HaveSameMap(['a'], Object.keys({a:1})));
print("Object.keys({a:1}) ---------------------- ");
%DebugPrint(Object.keys({a:1}));
print("\n['a'] ----------------------------------- ");
%DebugPrint(['a']);