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desc. in objects.h

//
// Most object types in the V8 JavaScript are described in this file.
//
// Inheritance hierarchy:
// - Object
//   - Smi          (immediate small integer)
//   - HeapObject   (superclass for everything allocated in the heap)
//     - JSReceiver  (suitable for property access)
//       - JSObject
//         - JSArray
//         - JSArrayBuffer
//         - JSArrayBufferView
//           - JSTypedArray
//           - JSDataView
//         - JSBoundFunction
//         - JSCollection
//           - JSSet
//           - JSMap
//         - JSStringIterator
//         - JSSetIterator
//         - JSMapIterator
//         - JSWeakCollection
//           - JSWeakMap
//           - JSWeakSet
//         - JSRegExp
//         - JSFunction
//         - JSGeneratorObject
//         - JSGlobalObject
//         - JSGlobalProxy
//         - JSValue
//           - JSDate
//         - JSMessageObject
//         - JSModuleNamespace
//       - JSProxy
//     - FixedArrayBase
//       - ByteArray
//       - BytecodeArray
//       - FixedArray
//         - DescriptorArray
//         - FrameArray
//         - HashTable
//           - Dictionary
//           - StringTable
//           - StringSet
//           - CompilationCacheTable
//           - CodeCacheHashTable
//           - MapCache
//         - OrderedHashTable
//           - OrderedHashSet
//           - OrderedHashMap
//         - Context
//         - FeedbackMetadata
//         - FeedbackVector
//         - TemplateList
//         - TransitionArray
//         - ScopeInfo
//         - ModuleInfo
//         - ScriptContextTable
//         - WeakFixedArray
//       - FixedDoubleArray
//     - Name
//       - String
//         - SeqString
//           - SeqOneByteString
//           - SeqTwoByteString
//         - SlicedString
//         - ConsString
//         - ThinString
//         - ExternalString
//           - ExternalOneByteString
//           - ExternalTwoByteString
//         - InternalizedString
//           - SeqInternalizedString
//             - SeqOneByteInternalizedString
//             - SeqTwoByteInternalizedString
//           - ConsInternalizedString
//           - ExternalInternalizedString
//             - ExternalOneByteInternalizedString
//             - ExternalTwoByteInternalizedString
//       - Symbol
//     - HeapNumber
//     - Cell
//     - PropertyCell
//     - Code
//     - AbstractCode, a wrapper around Code or BytecodeArray
//     - Map
//     - Oddball
//     - Foreign
//     - SharedFunctionInfo
//     - Struct
//       - AccessorInfo
//       - PromiseResolveThenableJobInfo
//       - PromiseReactionJobInfo
//       - AccessorPair
//       - AccessCheckInfo
//       - InterceptorInfo
//       - CallHandlerInfo
//       - TemplateInfo
//         - FunctionTemplateInfo
//         - ObjectTemplateInfo
//       - Script
//       - DebugInfo
//       - BreakPointInfo
//       - CodeCache
//       - PrototypeInfo
//       - Module
//       - ModuleInfoEntry
//     - WeakCell
//
// Formats of Object*:
//  Smi:        [31 bit signed int] 0
//  HeapObject: [32 bit direct pointer] (4 byte aligned) | 01