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In its current stage it would be better off improving php code and adding to the pear libraries.

public static function isFloat($value)
{
if (floatval($value) == $value) {
return $value;
}

return FALSE;
}

You would expect the method to return either TRUE or FALSE, but not the passed argument itself. I really hope this will be changed in future releases.

And about the wrapper thing: It’s fine to me if they wrap some of php native’s functions, since an oo approach can provide a cleaner way of error-handling (such as throwing exceptions). So if they do not bloat the framework with it, it’s okay to me.