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The description of lpeg.Cmt on describes
the behaviour when the called function returns a number, false, nil,
or no value. If I understand the example "Lua's long strings"
correctly, it can return true which does what I would expect: the
match is successful.

If this is correct, I'd suggest to add this clarification.

BTW: If I'd had to process a rather _large_ string, using lpeg.Cmt
would be the adequate tool, because the other options hold the
captures in memory until lpeg.match returns, right?