[Proposal] -DLUA_NOCONVF2I and -DLUA_NOCONVI2F

["Soni L." <fakedme@...>]

Float to integer conversions, especially the ones involving table keys, 
are considered harmful by a lot of the people who replied to my __key 
feature request. So instead I'd like to request -DLUA_NOCONVF2I. It 
should make those people happier, as it removes the closest analog to 
__key we currently have in the VM.

-DLUA_NOCONVF2I would apply to anything that requests an integer, all 
bitwise operators, and indexing operations. It should lead to a faster 
Lua VM and more robust code, as well as a lot more runtime errors.

-DLUA_NOCONVF2I would make t[1.0] and t[1] refer to different keys:

local t = {}
t[1.0] = "a"
t[1] = "b"
print(t[1.0], t[1]) --> a b

As well as produce an error in the following cases:

("str"):sub(1.0, -1.0)
1 << 1.0
1.0 | 0

-----------------------------

Integer to float conversions are the ones that happen when you mix 
integers and floats in expressions. Thisshould also lead to a faster Lua 
VM and more robust code, as well as a lot more runtime errors.

-DLUA_NOCONVI2F would make all of the following produce an error:

1.0 + 2 (mixed integer/float operations)
anything involving integers and the following operators: /, ^

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