[Simpletest-support] 'float' type does not work with assertIsA

[Jason S. <jsw...@ya...>]

'double' does work however.  I have not dug into the code, but I assume this is
just a switch somewhere that you could add a case for.

Probably makes sense to allow for anything that PHP would consider a valid type
cast:
http://www.php.net/manual/en/language.types.type-juggling.php#language.types.typecasting

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