The **set.prototype.issubsetof** package provides a spec‑compliant shim/polyfill for the upcoming `Set.prototype.isSubsetOf` method, allowing code to use the method even in environments that only support ES3. It exports a function that can be called directly or installed globally via `isSubsetOf.shim()`, and it automatically polyfills the `Set` implementation itself if necessary. The library is aimed at JavaScript developers who need reliable Set utilities across legacy browsers or Node versions.
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Support the dependencies of es-shims/set.prototype.issubsetof
Robustly `.call.bind()` a function
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