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Subject: return/parameter types for magic functions
From: smalyshev@gmail.com (Stanislav Malyshev)

Hi!

Since we now allow defining return value types for functions, one can
also create definition for magic functions that make no sense, such as
__toString() : float or __isset() : Closure. I think we should restrict
such definitions - either to types that makes sense or in case of
methods that aren't supposed to return anything useful, completely. We
already do this for ctors, dtors and __clone but not consistently for
other magics. Also some values for parameter types make no sense.

I've created a bug https://bugs.php.net/bug.php?id=69718 to track this.
Not sure if this really needs an RFC.
-- 
Stas Malyshev
smalyshev@gmail.com