As of PHP 8.1, it's possible to use new syntax as default value to functions params (rfc). However this doesn't seem to be supported in nette/di yet.

For example with lcobucci/jwt configuration.

Method annotation

ref

 public static function forSymmetricSigner(
        Signer $signer,
        Key $key,
        Encoder $encoder = new JoseEncoder(), // optional argument
        Decoder $decoder = new JoseEncoder(), // optional argument
    ): self {
        // ...
    }

DI config

- Configuration::forSymmetricSigner(
	signer: [instance of Signer]
	key: [instance of Key]
        # no $encoder or $decoder param passed
)

Output

Service of type Encoder required by $encoder in Configuration::forSymmetricSigner not found

When I pass JoseEncoder explicitly, it works.

Note: I removed FQNs for better readability.