parseint
An ES-spec-compliant `parseInt` shim/polyfill/replacement that works as far down as ES3
number.isfinite
An ES-spec-compliant Number.isFinite shim/polyfill/replacement that works as far down as ES3
number.isinteger
An ES-spec-compliant Number.isInteger shim/polyfill/replacement that works as far down as ES3
number.parseint
An ES-spec-compliant Number.parseInt shim/polyfill/replacement that works as far down as ES3