Why is std.algorithm.joiner explicitly not a forward range even when it can be?  This is not an oversight.  It appears to be an explicit decision.  From the unittest:

    static assert(isInputRange!(typeof(joiner([""], ""))));
    static assert(!isForwardRange!(typeof(joiner([""], ""))));


Maybe I'm missing something obvious, but I just can't think of any good reason for this decision.
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