[expr] logical "or" operator, counterpart to `[&&]`. Returns falsity if both arguments are boolean false, and truth otherwise. Note that this operator ''short-circuits'', and does not evaluate its second argument if the first is true. See `[|]` for bitwise "or".

    :   '''[expr]''' { ''[[a b c]]'' '''`||`''' ''[[d e f]]'' }

Note that this operator does not have a command equivalent in [tcl::mathop]; use the [if] command instead.

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