C3 0.7.11: closing out the 0.7 series before 0.8

C3 0.7.11 is the final release in the 0.7 series.

This version focuses on tightening semantics, improving type inference, and cleaning up edge cases rather than adding new features. Some parts of the standard library (like matrices) have also been reworked.

The goal is to stabilize behavior and reduce inconsistencies before starting the 0.8 cycle.

C3 is aiming to stay close to C in terms of control and predictability, while reducing complexity in everyday use.