script – Undefined opcodes in bitcoin core outlined as “Synonyms for OP_RETURN” in rust-bitcoin

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In rust-bitcoin, opcodes previous the 0xba opcode are named as such: OP_RETURN_187, OP_RETURN_188, …, OP_RETURN_254. Their description is the entire similar: Synonym for OP_RETURN. The definition for OP_RETURN is Fail the script straight away. (Will have to be completed.)., which means (if I perceive appropriately) {that a} script that incorporates an OP_RETURN in an unexecuted department of an OP_IF remark isn’t made invalid through the only presence of the opcode.

But within the bitcoin core codebase, the ones opcodes aren’t even outlined within the opcode enum, and a line defines the utmost worth that an opcode will also be to be 0xb9. In combination those two imply I am not rather positive what to make of those opcodes… are they legitimate? Now not legitimate? Can they be used as rust-bitcoin implies, or now not used as bitcoin core implies? I suppose there may be extra to this tale, however simply having a look on the codebases as is I wasn’t in a position to get a really feel for the right way to describe those opcodes.

Additionally implied on this query is: if they’re certainly synonyms to OP_RETURN as rust-bitcoin signifies, can they be used interchangeably and rather than OP_RETURN the best way it’s used for storing knowledge?

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