view .arcconfig @ 43415:a8454e846736 stable

import-checker: open all source files as utf-8

Before, we opened in text mode and used the default encoding
to interpret the bytes within.

This caused problems interpreting some byte sequences in some
files.

This commit changes things to always open files as UTF-8, which
makes the error go away.

test-check-module-imports.t now passes on Python 3.5 and 3.6
with this change.

Differential Revision: https://phab.mercurial-scm.org/D7225

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