RegExp backreferences

Currently, attempting to use a RegExp with backreferences throws an error: `error: backreferences are not supported` They might seem niche and not-very-often used, but that unfortunately breaks much more stuff than one could expect They are used in https://www.npmjs.com/package/get-intrinsic, which in turn is chain-required by things like: * https://www.npmjs.com/package/set-function-length * https://www.npmjs.com/package/call-bind * https://www.npmjs.com/package/is-arguments * https://www.npmjs.com/package/util * https://www.npmjs.com/package/which-typed-array * https://www.npmjs.com/package/is-typed-array * https://www.npmjs.com/package/is-array-buffer * https://www.npmjs.com/package/assert * ... etc In Node.js, it is supported back to at least 0.8