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optional argument notation

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I notice that in all of your documents (including SRFI-1) you use this
notation for optional arguments:

    string-hash    s [bound start end] -> integer

I find this notation to be missleading because it suggests that you
can only pass one or four parameters (but I believe you want 1, 2, or
4).  So you should write:

    string-hash    s [bound [start end]] -> integer