sabre/xml is an XML library that you may not hate.
This has been released as a major release to be sure that consumers can implement it as-and-when they wish, just in case someone has some code that depends on the Windows file path URI parsing that changed a bit between sabre/uri
2 and 3.
The use of sabre/uri
major version 1 has also been dropped - that major version is very old, and everyone should be on major version 2 with PHP 7.4 or later anyway.
Major version 3 implements type declarations for input parameters, function returns, variables etc. It supports PHP 7.4 and PHP 8. When you upgrade to major version 3, if you extend classes etc., then you will need to make similar type declarations in your code.
functionCaller
deserializer function for executing a callable when reading a XML
element (@vsouz4)