Forbid static fields named caller

[onigoetz]

This field is actually reserved ... So it would be good to forbid to use them.

You can assign a value to it, but the value isn't kept.

Just lost about two hours figuring out why a callback wasn't called :D

https://developer.mozilla.org/fr/docs/Web/JavaScript/Reference/Objets_globaux/Function/caller

[npiguet]

This is actually true for most non-writable fields that are part of the basic function properties. This includes both fields and methods. Some poperties are writable, some are not. Declaring static fields or static methods in the java class with the same name as any of those properties could have unexpected results.

Fields:
arguments, arity, caller, displayName, length, name, prototype

Methods:
apply(), bind(), call(), isGenerator(), toSource(), toString()

For some of them, we should probably throw an error (the ones that are not writable), for some others a warning might enough.