"Son Luong Ngoc via GitGitGadget" [off-list ref] writes:
From: Son Luong Ngoc <redacted>
As the old versions of dash is deprecated, dollar-sign inside
artihmetic expansion is no longer needed.
This ensures t5319 follows the coding guideline updated
in 'jk/arith-expansion-coding-guidelines' 6d4bf5813cd2c1a3b93fd4f0b231733f82133cce.
That does not match my understanding of the guideline. By removing
the "dollar required" rule and not adding a new "dollar forbidden"
rule, we pretty much declared that "we do not care much either way"
[*1*].
Even if we cared, "Once it _is_ in the tree, it's not really worth
the patch noise to go and fix it up." rule from the guidelines
applies here.
Thanks.
[Reference]
*1* https://lore.kernel.org/git/20200505210741.GB645290@coredump.intra.peff.net/ (local)