[antonsoo]

Copying or pickling a PinJoint loses an explicitly set distance. RatchetJoint.angle is also replaced with the current relative body angle:

import pymunk

a, b = pymunk.Body(1, 1), pymunk.Body(1, 1)
b.position = (3, 4)
pin = pymunk.PinJoint(a, b)
pin.distance = 8
print(pin.copy().distance)  # Before: 5.0; after: 8.0

ratchet = pymunk.RatchetJoint(a, b, 0, 0.5)
ratchet.angle = 1.5
print(ratchet.copy().angle)  # Before: 0.0; after: 1.5

Include both properties in the existing general-state lists so restoration applies their native setters after construction. This also preserves them when copying or pickling an entire Space.

Validation:

• Copy/deepcopy regressions and updated pickle tests fail on the original source and pass with the fix. The full python -m pymunk.tests run passes (289 tests, two skipped).
• Ran 48 native pendulum/ratchet continuations across three checkpoints and four copy/pickle methods. All 32 previously divergent cases now match freshly constructed reference worlds with the saved physical settings; the 16 controls remain identical.
• Ran the shipped constraints demo headlessly with configured joints, copying/pickling at three checkpoints. All six continuations match explicitly restored reference settings over 240 steps.

These checks cover the saved public joint state; they do not claim that all solver caches are serialized. Validation used Linux and Python 3.12. Existing unrelated mypy and whole-file formatting failures are unchanged; the edited test module passes Black.

[viblo]

Thanks for finding and fixing this bug!