Column titles:
FD: Function declaration
FE: Function expression
AF: Arrow function
C: Class declaration and class expression (“body” entries refer to class constructor)
M: Method
Cells:
✓ exists, allowed
× does not exist, not allowed
Empty cell: not applicable, not relevant
lex: lexical, inherited from surrounding lexical scope
F.p: Function.prototype
SC: superclass for derived classes, Function.prototype for base classes
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