templater: consistently join() string-like object per character (BC)
The old behavior was copied from join() of a lazy generator string, which
was unified to the behavior of join() of a byte string by the previous patch.
This patch fixes the mappable type to do the same.
Mercurial
=========
Mercurial is a fast, easy to use, distributed revision control tool
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$ make # see install targets
$ make install # do a system-wide install
$ hg debuginstall # sanity-check setup
$ hg # see help
Running without installing::
$ make local # build for inplace usage
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See https://mercurial-scm.org/ for detailed installation
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