[Proposal] Support "inf", "-inf" and "-nan" in tonumber()

Current Lua implementation of tonumber() does not handle values
"inf", "-inf" and "-nan" for string that supposed to be number value.

But tostring() function produces them:

   Lua 5.5.0  Copyright (C) 1994-2025 Lua.org, PUC-Rio
   > tostring(1/0)
   inf
   > tostring(-1/0)
   -inf
   > tostring(0/0)
   -nan

So tostring() value is useless for decoding number using tonumber():

   > tonumber(tostring(1/0))
   nil

-- Martin

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