Uploaded patch for my "Uniform Compare" mod

[Chris Marrin <chris@...>]

I have uploaded a power patch named "Equality operators that work like 
arithmetic operators". It allows the comparison of dissimilar lua types. 
As long as one has a __eq, __lt or __le metamethod (depending on the 
test being performed), it will call that metamethod. This is unlike 
today where tests with dissimilar types throws an error.

I did this to allow the creation of userdata objects that are wrappers 
around primitive types. For instance my system has an SFDouble object. 
This behaves like a number, but can fire events, etc. To Lua it looks 
like a userdata. This patch allows you to say:

    local n = SFDouble(5.7)
    if n < 3 then ...

The __lt metamethod I wrote for this will convert both sides to a 
primitive number, perform the numeric comparison, and return the result.

Please see the notes I put in the power patch for caveats to this 
approach and a way I believe it could be resolved to better control the 
behavior of this sort of operation.

Since this is my first Lua patch, also please let me know if I have done 
anything wrong!

--
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"As a general rule,don't solve puzzles that open portals to Hell"'