Understanding v28.0 PayToAnchor script

I am trying to understand the new PayToAnchor script, which is part of v28.0. Here is the script definition:

https://github.com/bitcoin/bitcoin/blob/master/src/script/script.cpp#L207-L222

As I understand, the above script would translate to following:

op_true op_pushdata4 2 4e73

Can someone please confirm that this is correct understanding? Also, what the reason for this particular script for PayToAnchor? It appears that it is not validated - interpreter.cpp#VerifyWitnessProgram, so the script could have been anything else. Is there any specific reason for using this particular script for PayToAnchor?



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