How does composer handle multiple versions of the same package?

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To question 1

Yes Composer can only install one version of each extension/package.

To question 2

Because of answer 1: Composer would consider your main project and the external package as incompatible.

In this case you could

  • stay with version 5 at your main project too.
  • ask the external package owner to upgrade to version 6 too if it’s compatible to.
  • fork the external package and make it compatible to version 6 yourself

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