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debug.upvalueid()

debug.upvalueid (f, n)

Returns a unique identifier (as a light userdata) for the upvalue numbered n from the given function.

These unique identifiers allow a program to check whether different closures share upvalues. Lua closures that share an upvalue (that is, that access a same external local variable) will return identical ids for those upvalue indices.

Links:

https://www.lua.org/manual/5.3/manual.html#pdf-debug.upvalueid

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2025-01-10 15:47:30

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