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bug#50965: Allow nil third argument for mapconcat

From: Stefan Kangas
Subject: bug#50965: Allow nil third argument for mapconcat
Date: Sat, 2 Oct 2021 15:22:44 +0200 
Severity: wishlist

Please consider allowing an empty third argument for mapconcat that
means the empty string, i.e.:

    (mapconcat FUNCTION SEQUENCE SEPARATOR)

Becomes:

    (mapconcat FUNCTION SEQUENCE &optional SEPARATOR)
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