Forces <data> to be a real data type with the following
semantics:
- If <data> is a real, <data> itself is returned.
- If <data> is an integer, <data> itself is returned, in its real form.
- If <data> is a boolean, its numeric value is returned (either 1.0 or 0.0).
- If <data> is an array, the count of its items is returned.
- If <data> is a hash, the count of its items is returned.
- If <data> is a string, its length is returned.
- If <data> is an object, 0.0 is returned if the reference is null (invalid) and 1.0 otherwise
This function is similar to the C (double) cast.
Note that since KVIrc does most of the casting work automatically
you shouldn't need to use this function.
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