You asked for the difference in code, and that's constant-folding here.
But that's not per se a justification for missing COW.
There might be other implementation details involved:
- Dave_the_M mentioned "complex rules",
- eyepops referenced a talk about efficiency considerations.
- Or it's a bug,
- or it's just a yet not implemented optimization feature.
That's all hard to tell without being a full-time p5p.
Sometimes things would make sense from a purist's point of view, but are just too obscure to justify the overhead to implement it.
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