feat: Introduce BooleanT and boolean functions (#17)

This PR adds a boolean section, as well as an isNaN predicate on numbers. In a TypeDispatcher, when BooleanT is present, isNaN returns a BooleanT. However, in a numbers-only TypeDispatcher, it returns 1 or 0 instead. Moreover, when booleans are subsequently added to a numbers-only instance, isNaN properly reconfigures itself to return BooleanT.

No predicates that depend on approximate equality testing or a configuration object are implemented in this PR.

This PR also implements type matching and dispatching with implicit conversions, and adds an implicit conversion from BooleanT to NumberT.

Reviewed-on: #17
Co-authored-by: Glen Whitney <glen@studioinfinity.org>
Co-committed-by: Glen Whitney <glen@studioinfinity.org>

src/boolean/__test__/BooleanT.spec.js

@@ -0,0 +1,24 @@
+import assert from 'assert'
+import {BooleanT} from '../BooleanT.js'
+import math from '#nanomath'
+
+describe('BooleanT Type', () => {
+   it('correctly recognizes booleans', () => {
+      assert(BooleanT.test(true))
+      assert(BooleanT.test(false))
+      assert(!BooleanT.test(null))
+      assert(!BooleanT.test(1))
+   })
+   it('autoconverts to number type', () => {
+      assert.strictEqual(math.abs(false), 0)
+      assert.strictEqual(math.absquare(true), 1)
+      assert.strictEqual(math.add(true, true), 2)
+      assert.strictEqual(math.divide(false, true), 0)
+      assert.strictEqual(math.cbrt(true), 1)
+      assert.strictEqual(math.invert(true), 1)
+      assert.strictEqual(math.multiply(false, false), 0)
+      assert.strictEqual(math.negate(false), -0)
+      assert.strictEqual(math.subtract(false, true), -1)
+      assert.strictEqual(math.quotient(true, true), 1)
+   })
+})