Function constants for Identity and No-op

[Allen Wirfs-Brock]

> On Aug 10, 2016, at 8:46 AM, Peter van der Zee <ecma at qfox.nl> wrote:
> 
> There is precedent (at least in IE [1]) for exotic functions where
> `typeof` returned "unknown". Could happen for any exotic value unless
> >>the spec changed on that<<. 

see https://tc39.github.io/ecma262/#sec-typeof-operator-runtime-semantics-evaluation <https://tc39.github.io/ecma262/#sec-typeof-operator-runtime-semantics-evaluation> 


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