[Json] Proposed minimal change for duplicate names in objects

[Paul Hoffman <[e-mail]>]

<chair hats on>

Do either or both of these proposals work for people in the WG?

--Matt Miller and Paul Hoffman

The following are proposed minimal changes to make the JSON spec interoperable with respect to
objects that have duplicate names.

Proposal 1:

In section 2.2 (Grammar -> Objects):
  No change
In section 4 (Parsers):
  Add: "If a parser encounters an object with duplicate names, the parser MUST use only the last
  name/value pair that has the duplicate name.
In section 5 (Generators):
  Add: "The names within an object SHOULD be unique."

Proposal 2:

Same as Proposal 1 *except* that a second sentence is added for section 4: "A parser that streams
  its outputs MUST fail to finish parsing if it encounters more than one name/value pair with the
  same name."