fix(math): correct type signatures for copysign, fmod and curried bindings

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Problem

Three type-signature bugs slipped through in PR #251 (math module expansion):

1. math.copysign: the y parameter was typed as int, but Python's [math.copysign(x, y)]((docs.python.org/redacted) takes two floats. Passing an int literal won't cause a runtime error (Python coerces), but it breaks F# callers who pass a float value for y.

2. math.fmod: parameters were typed int * int -> int, but [math.fmod(x, y)]((docs.python.org/redacted) computes the floating-point remainder — it takes and returns float, not int. Callers needing 5.5 % 2.2 would be unable to use the binding.

3. Curried multi-parameter syntax: comb, pow, atan2, and dist used the F# curried arrow -> form for multi-parameter abstract members (e.g. abstract comb: n: int -> k: int -> int). All other multi-parameter bindings in the codebase use the tupled * form (e.g. abstract comb: n: int * k: int -> int). Consistent tupled syntax avoids potential partial-application surprises and matches the rest of the binding style.

Fix

• copysign: x: float * y: float -> float (was x: float -> y: int -> float)
• fmod: x: float * y: float -> float (was x: int -> y: int -> int)
• comb, pow, atan2, dist: curried → tupled multi-param style

Trade-offs

• The fmod/copysign changes are technically breaking for anyone using the old (buggy) signatures — but since the old signatures were wrong and this is a pre-release (rc), the fix is appropriate now.
• No new functions added; pure correctness fix.

Note

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[dbrattli]

Superseded by the fixes in PR #251 (commit 37c8b3e) which addresses all the same issues: copysign y:int→float, fmod int→float, and curried→tupled conversion for comb/pow/atan2/dist, with updated tests. All 287 tests pass.