Is 'clientMutationId' needed anymore?

[fiyazbinhasan]

As of this pull request, facebook/relay@3838691

RelayModern has no requirements on mutations beyond the general mutation specs. Specifically, the additional requirements that are no longer required are:

• clientMutationId (even RelayClassic only required this because of FB internal reasons)
• $input objects, with RelayModern the input to mutations can come either as one big object or multiple mutation arguments.

As clientMutationId is no longer needed in RelayModern, we can remove the MutationInputGraphType altogether. Instead, we can use the actual InputGraphType. Do you guys agree?

[Shane32]

Sounds reasonable to me.