...unless we find some legitimate use case. Currently it's supported via pcmk__xml_update() -> copy_in_properties() -> expand_plus_plus().

It's a pain to read and maintain, but more importantly CIB replace operations don't treat "<attr>++" and "<attr>+=<int>" specially. They set the values as unexpanded strings.

Ideally, a modify operation and a replace operation should both set the same attribute value in the CIB for the same input attribute value.

https://github.com/ClusterLabs/pacemaker/pull/3413#issuecomment-2035493624