Whether a string contains a subsring, with case-insensitive, locale-insensitive search. See https://github.com/adobe/react-spectrum/blob/70e769acf639fc4ef3a704cb8fad81349cb4137a/packages/%40react-aria/i18n/src/useFilter.ts#L57. See also https://github.com/arty-name/locale-index-of, and https://github.com/tc39/ecma402/issues/506.
Whether a string contains a subsring, with case-insensitive, locale-insensitive search. See https://github.com/adobe/react-spectrum/blob/70e769acf639fc4ef3a704cb8fad81349cb4137a/packages/%40react-aria/i18n/src/useFilter.ts#L57. See also https://github.com/arty-name/locale-index-of, and https://github.com/tc39/ecma402/issues/506.