OP_PAIRCOMMIT as a candidate for addition to LNhance

Protocol Design
4

It would be possible with OP_CAT to closely emulate OP_PAIRCOMMIT, they are more complicated and or more expensive. We have redundancies in bitcoin script for much smaller optimizations.

<x1> <x2>
OP_SWAP
OP_SIZE
<0x00000001>
OP_ADD
OP_TOALTSTACK
OP_SWAP
OP_SIZE
<0x00000001>
OP_ADD
OP_TOALTSTACK
OP_CAT
OP_FROMALTSTACK
OP_CAT
OP_FROMALTSTACK
OP_CAT
OP_HASH256

or simply

<x1> <x2>
OP_HASH256
OP_SWAP
OP_HASH256
OP_SWAP
OP_HASH256
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