Allow built-in functions to be construct only #1603
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With the explicit DUK_HOBJECT_FLAG_CALLABLE it's now possible to create functions that are constructable but not callable as normal functions. This is a prototype branch to see how that would work out in practice for built-in functions. The upside would be that no explicit
duk_require_constructor_call()
would be required which is smaller (and slightly faster). It would then be possible to expose a public API to create non-constructor and construct-only functions.Work in progress.