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On 11/14/2012 6:05 AM, Roberto Ierusalimschy wrote:
One of the main reasons that Lua uses double is to support full 32 bits. With a natural 32-bit integer, you could compile Lua with single floats and then really reduce memory usage. But the introduction of integers also solve a big reverse problem. Frequently, restricted systems compile Lua with longs as its number type. And frequently, there is the problem of how to manipulate floating point numbers on those systems. Lua with 32-bit integers and single floats would use much less memory, offering full 32 bits when needed, the speed of integers for hardware without FP support, and floating point number when necessary. -- Roberto

This would be especially useful for embedded use, since there are many recent 32-bit MCUs with hardware single precision floating point (but not double precision), and plenty of memory to run eLua or other minimal Lua systems.