I'll submit a patch for s/where/when/ later todayMonday.
If "a ~~ b" were equivalent to "b ~~ a", smart matching would be commutative. It's not equivalent, so it's not commutative. As previously mentioned in the doc, smart matching was commutative in 5.10.0. It only mattered in edge cases, and it made overloading and other factors impossibly complex to handle and/or implement.
Vulgar means ordinary, plain, unspecial. In other words, a code ref on the LHS will be treated the same as any other scalar. It's actually redundant with the previous phrase.
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