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As Composer 2.3 is dropping PHP 5.3 and requires 7.2.5+ as the minimum PHP version, so does Box.
In theory it would be possible to keep the 5.3 compatibility, but that would require non trivial efforts as it would require to make the bundle requirement checker work without Composer autoloading and keeping track of Composer Semver too.
Since 7.2.5 is now the minimum, the requirement checker has been pimped up a bit.
Closes #656