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On Mon, Feb 1, 2021 at 8:05 PM Viacheslav Usov wrote:
it looks like you are asking for a full
list of operations that could change a previously seen upvalue ID for
a given contiguously existing chunk.

I was asking whether a GC activity could change a previously seen upvalue ID.

Lua's (stock) GC is non-moving.

The manual does not promise this.
That's why I have posted my question.
I was not asking about GC implementation details.
I was interested in what Lua does guarantee about upvalue ID.