Require a strict_types declaration #488
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Fixes #33
The current
composer.jsonfile requires version 3.6.1 or better of PHP_CodeSniffer. That version and versions up to 3.7.2 only check that there is a declaration, but not if the declaration is setting the feature on/off. From version 3.8.0 onwards, the sniff also asserts that the feature is enabled. While this is a useful feature, I'm undecided if the minimum version for PHP_CodeSniffer should be increased as part of this pull request.