unknown return code: -4

[prz23]

[prz23]

The case with -4 will cause an error, and data is transient..

[Byron]

Indeed, the code triggered is here and it seems like -4 refers to Z_MEM_ERROR.

I think it that should be handled as well and cause an error instead.

Would you like to contribute this as PR? I'd do it too but can't merge my own PRs, so having a base-PR would be helpful to get a fix more quickly.