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    Variable DEFAULT_FRICTIONConst

    DEFAULT_FRICTION: 0.5

    Default Coulomb friction coefficient.

    Not fixed by the specification (Appendix A pins the combine modes, not the coefficients), so 0.5 is chosen here: a mid-range value that neither slides like ice nor grips like rubber, and the same number the mainstream solvers this API sits above use as their own default (decision, WP-5.1).