spec: is now stage 4 (#111)

Proposal is stage 4 (#110)

Remove resolved issues from README (#109)

Editorial: consistently use tombstones (#100)

Normative: bugfix: do not count ~empty~ in set sizes (#105)

Bugfix: update index after use in Set.prototype.difference (#104)

Bugfix: fix a missed ~empty~ check in isSubsetOf (#102)

Normative: remove IsCallable check in GetKeysIterator (#101)

Normative: throw on negative set sizes (#88)

link issues

link outstanding issues

link tracking issue in readme

Remove sort from intersection (#94)

Fix broken link for es-shims symmetricDifference polyfill (#92)

Add es-shims polyfills (#90)