Firefox's Spidermonkey used to support a similar notation for JS objects. I can't remember when it was removed, but it was pretty obscure: http://blog.notdot.n

Firefox's Spidermonkey used to support a similar notation for JS objects. I can't remember when it was removed, but it was pretty obscure: http://blog.notdot.net/2006/9/Serializing-JavaScript-objects-with-circular-references http://blog.notdot.net/2006/9/Serializing-JavaScript-objects... http://philogb.github.io/blog/2009/03/24/sharp-variables/ http://philogb.github.io/blog/2009/03/24/sharp-variables/ https://developer.mozilla.org/en-US/docs/Archive/Web/Sharp_variables_in_JavaScript https://developer.mozilla.org/en-US/docs/Archive/Web/Sharp_v...