ECMA-402 Intl spec's internal `FallbackSymbol`
https://github.com/ljharb/intl-fallback-symbol.git
ECMA-402 Intl spec's internal FallbackSymbol.
This Symbol is well-known - shared across realms.
It is present in the following engines with the description "IntlLegacyConstructedSymbol" (spec):
"IntlFallback": (The ES2017 Intl spec did not specify a description)
undefined.
var IntlFallbackSymbol = require('intl-fallback-symbol');
var assert = require('assert');
assert(typeof IntlFallbackSymbol === 'symbol');
npm install, and run npm test