feat: Narrow tsc typing of operation dependencies/implementations

src/interfaces/arithmetic.ts

@@ -0,0 +1,20 @@
+import type {ClosureType, NaNType, RealType} from './type'
+
+type UnOp<T>  = (a: T) => T
+type BinOp<T> = (a: T, B: T) => T
+
+declare module "./type" {
+   interface CommonInterface<T, Aux> {
+      add:              BinOp<T>
+      unaryMinus:       UnOp<T>
+      conj:             UnOp<T>
+      subtract:         BinOp<T>
+      multiply:         BinOp<T>
+      square:           UnOp<T>
+      absquare:         (a: T) => RealType<T>
+      reciprocal:       UnOp<T>
+      divide:           BinOp<T>
+      conservativeSqrt: (a: T) => (T | NaNType<T>)
+      sqrt:             (a: T) => (T | ClosureType<T>)
+   }
+}