Tilde
~2.1, means 2.1.0 <= version < 3.0.0~2.1.1, means 2.1.1 <= version < 2.2.0
Caret
// - ^2.1, means 2.1.0 <= version < 3.0.0
^2.1.1, means 2.1.0 <= version < 3.0.0
Wildcard
2.1.*, means 2.1.0 <= version < 2.2.0
composer-version-constraint
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