Proposal rejected.

[ljharb]

In the March 2016 TC39 meeting, I brought this proposal to the committee.

It was thoroughly rejected, for a number of reasons. Primarily, that toJSON is a legacy artifact, and a better approach is to use a custom replacer that, for example, checks [Symbol.toStringTag] and dispatches to appropriate serializations.

In addition, the committee did not want to bless the toJSON approach by adding what would be an incomplete representation - one that would not obviate the need for developers to define their own serialization format and revivification logic.

(tc39/ecma262#506)

[DavidBruant]

Sounds good, thanks for all the time you spent on this @ljharb and @zloirock ! :-)