Added functions from node/vms/dexvm/math:
- Div64: safe division with error on zero
- MulBig: multiply uint64s returning big.Int
- MulDiv64: (a * b) / c without overflow
- MulDivRoundUp64: ceiling division variant
- BigMulDiv: big.Int multiplication+division
- BigMulDivRoundUp: big.Int ceiling variant
- Clamp: generic ordered type clamping
Also added common big.Int values (bigZero, bigOne, maxUint64Big)
for performance in division operations.
- Add Zero[T any]() generic function for zero values
- Add IsSortedBytes for byte slice sorting checks
- Add heap/queue.go with priority Queue[T] implementation
- Add heap/map.go with indexed Map[K,V] for heap operations
- Add linked/list.go with doubly-linked List[T]
- Add linked/hashmap.go with ordered HashMap[K,V]
- Update sampleable_set.go to use local luxmath.Zero[T]()
- Update averager_heap.go to use github.com/luxfi/math/heap
- Update safe_math.go to use luxmath.Zero[T]()
- Remove github.com/luxfi/utils dependency entirely
- Replace github.com/luxfi/node/utils with github.com/luxfi/utils
- Replace github.com/luxfi/node/utils/sampler with github.com/luxfi/sampler
- Replace github.com/luxfi/node/utils/wrappers with github.com/luxfi/utils/wrappers
- Replace github.com/luxfi/node/utils/json with github.com/luxfi/utils/json
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