Stas Malyshev wrote (on 15/07/2014):
Having more than one set of rules for implicit cast makes no sense to me at all and will only lead to more confusion and frustrated users.
That's only a problem if you frame the new hints as "a type of implicit cast". If they were to be described in relation to existing functionality, I'd describe them as a new type of *explicit* cast, but as mentioned elsewhere, I'd be happy for them to exist outside of function signatures too as a new notion of "strict cast".
That way, we remove the expectation that they will act the same as some other feature, and can simply evaluate their usefulness as a new, separate, feature.
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