Common variance rules don't apply to constructors #29
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arnaud-lb force-pushed the constructor-variance branch from d1f219a to 12ff59d Compare 
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This allows constructors to take covariant parameters, which is safe and quite useful. After this PR, https://phpstan.org/r/16b7f23e-34e1-42b3-9ec7-f80beb120caa reports no error.