On Sat, Oct 21, 2023 at 01:08:03AM -0400, Ethan Heilman via bitcoin-dev wrote: > OP_CAT fails if there are less than two values on the stack or if a > concatenated value would have a combined size of greater than the > maximum script element size of 520 Bytes.
Note that if OP_CAT immediately _succeeds_ if the combined size is >= 520
bytes, reverting to the behavior of OP_SUCCESSx, the maximum size can be
increased in a subsequent soft fork.
Of course, this would often require extra opcodes to validate the size of
non-const arguments. But you'd only need another five or six bytes in many
cases:
SIZE <n> LESSTHAN VERIFY
<fixed data>
CAT
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