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dalbit-polyfill

Polyfill libraries for dalbit used transpiling luau to lua (especially Lua 5.3)

Implementations

Globals

• typeof
• unpack
• newproxy
• gcinfo
• More details here

Libraries

• buffer
• math
• os (sandboxed)
• string
• table
• debug
• bit32
• utf8

TO-DOs

• Benchmarks next polyfill functions (between luauNext and djb2Next)

Limitations

• Please do not depend on error messages. since we can't compare table and number(primitive types), polyfill's custom types such as userdata type will be shown as table when comparing numbers like this example code.

local a = newproxy() < 2 -- errors: "attempt to compare table < number"
-- correct error message: "attempt to compare userdata < number"

• Please do not depend on hash table's orders. while the polyfill is trying to use/imitate Luau's hash table implementations, it might still have some critical edge cases with orders(especially with number hashing and pointer hashing. the order is not guaranteed as Luau's one)
• Lua 5.3 has integers so there may be slightly different behavior.
• There may still be differences from Luau due to differences in Lua version and environment.

Special Thanks

• Luau - Some implementations of the polyfill were inspired/ported from original Luau's source code(especially hash tables)
• Dekkonot - For bitbuffer and hashing function that calculates a * b mod 32 for polyfill's luauNext implementation.
• Contributors of kaledis - For bugs/issues finding/solving(especially bit32 implementations for Lua 5.1) and battle testing in their cool project.