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guard against locale-specific sorting

Node will use the current environment's locale sorting for
String.localeCompare.  Thankfully, String.localeCompare can take a
second argument to specify the locale.  Up until Node 13, any valid
argument provided to the function _may_ be respected if Node was
compiled with Intl support, or would always be treated as `'en'`
otherwise.

The solution is to always set the locale to `'en'`.  An alternative
solution would be to compare strings based on byte order, but this does
not provide ideal ergonomis.

To verify this, the locale is set in the test environment to `'sk'`,
which has a significantly different alphabet, including sorting words
starting with `'ch'` _after_ words starting with `'d'`.

Re: npm/cli#2829
Fix: #276

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