Description:
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Scalar type hint implementation introduces inconsistency in type naming.
The canonic name for float/double/real is float.
But the introduced method for them is ::isDouble().

@see http://php.net/manual/en/language.types.float.php
@see http://php.net/manual/en/function.is-float.php
@see http://php.net/manual/en/function.is-double.php (alias)
@see http://php.net/manual/en/function.is-real.php (alias)
@see http://php.net/manual/en/function.floatval.php
@see http://php.net/manual/en/function.doubleval.php (alias)
@see http://php.net/manual/en/class.splfloat.php