Array sort from Lua 5.1.5#158

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mingodad wants to merge 3 commits intoalbertodemichelis:masterfrom

mingodad:array-sort

Commits on Sep 10, 2018

Add simple tests to help development and detect regressions
mingodad
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Remove/rename shadowed vars
mingodad
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Change the array sort by the one from Lua 5.1.5, it can sort with about half the calls made by the original sort function.
mingodad
committed