Why does Symbol.for and Symbol.keyFor are limited to strings?

[Gary Guo]

Why not? Symbol's [[Description]] internal slot is string

> Date: Fri, 2 Jan 2015 18:18:55 +0100
> Subject: Why does Symbol.for and Symbol.keyFor are limited to strings?
> From: michalwadas at gmail.com
> To: es-discuss at mozilla.org
> 
> What is reason behind restricting entries in global symbol registry to
> be indexed only by strings?
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