It is not merely a matter of style. It is also a matter of program context, and wheter or not the name is more ambigious with the plural (or singular (thanks for freshing up the mind)) and may not provide as much context as could be intended.

Therefor a programmer expecting to have his code reviewed or updated should be well considering the use of plural or singular form on each variable name, and the matter of style should be thrown overboard on this specifick isue... (Or should it not...?!?)

er formait hyarya.
"Field experience is something you don't get until just after you need it."

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