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Update

I found a SO post with a similar issue (problem using Composer with code-migration repo). I followed the steps provided in this answer but encountered the same errors regardless.

I'm somewhat new to Composer, but I notice that the version requirements in the composer.lock for PHP is set as ~5.5.0|~5.6.0|~7.0.0, but the PHP version requirement found in the composer.json file is set as ~5.5.0|~5.6.0|~7.0.0|~7.1.0. Should the composer.lock file reflect the same PHP version requirements as the composer.json?

I'm somewhat new to Composer, but I notice that the version requirements in the composer.lock for PHP is set as ~5.5.0|~5.6.0|~7.0.0, but the PHP version requirement found in the composer.json file is set as ~5.5.0|~5.6.0|~7.0.0|~7.1.0. Should the composer.lock file reflect the same PHP version requirements as the composer.json?