Plan for using TokenType constants instead of Doctrine\ORM\Query\TokenType\Lexer ?

[revollat]

Hi, I noticed that the DQL defined functions uses Doctrine\ORM\Query\TokenType\Lexer constants (e.g. Lexer::T_IDENTIFIER) to parse AST but those constants now lives in Doctrine\ORM\Query\TokenType (at least for Doctrine ORM version 3.2.1)
I can contribute to make this changes if anyone is interested.