It's unclear which class membes (properties) are public/private/internal, as we document none of them.

I use the JSDuck convention here (as I understand it):

• public: Documented, stable and free to use in third-party code.
• private: Documented, unstable, free to use in non-third-party subclasses.
• internal: Unstable, undocumented.

Some of the properties are documented in PHP code, but not all.

Version: unspecified
Severity: enhancement