Ser: a new old serialization library

[ivan]

For example:

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f = io.open('out.txt', 'w')
f:write(string.format("%.17g\n", 1))
f:write(string.format("%.17g\n", 1/2))
f:write(string.format("%.17g\n", 1/3))
f:write(string.format("%.17g\n", 1/4))
f:write(string.format("%.17g\n", 1/5))

Outputs:

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1
0.5
0.3333333432674408
0.25
0.20000000298023224

Not a major issue since with 32-bit floats it would just be truncated during loading.
I guess it could lead to imprecision when the serialization output from a 32 bit distribution is used with a 64 bit distribution (which is not supposed to happen anyways).
Again, it's a minor thing so I wouldn't be too worried about it.

[Robin]

Yeah, I think the only downside is that slightly more bytes than needed will be used for 32-bit builds, but that's a trade-off I'm willing to make for maintainability, especially because I don't think Ser will be used often with those builds.

[ivan]

Hi Robin,I still use "ser" in several projects/tools and it works great.
However, I have recently noticed something:

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local pairs, ipairs, tostring, type, concat, dump, floor, format = pairs, ipairs, tostring, type, table.concat, string.dump, math.floor, string.format

Testing with LuaJIT suggests that it's actually faster to avoid the first four locals:

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local concat, dump, floor, format = table.concat, string.dump, math.floor, string.format

There is no difference in performance with vanilla Lua.