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import { LazyArbitrary } from './_internals/LazyArbitrary.js'; import { safeHasOwnProperty } from '../utils/globals.js'; const safeObjectCreate = Object.create; export function letrec(builder) { const lazyArbs = safeObjectCreate(null); const tie = (key) => { if (!safeHasOwnProperty(lazyArbs, key)) { lazyArbs[key] = new LazyArbitrary(String(key)); } return lazyArbs[key]; }; const strictArbs = builder(tie); for (const key in strictArbs) { if (!safeHasOwnProperty(strictArbs, key)) { continue; } const lazyAtKey = lazyArbs[key]; const lazyArb = lazyAtKey !== undefined ? lazyAtKey : new LazyArbitrary(key); lazyArb.underlying = strictArbs[key]; lazyArbs[key] = lazyArb; } return strictArbs; }