encoding/json: check that Marshal/Unmarshal have fast paths for string, int, float64

[gopherbot]

by araddon:

When writing custom UnmarshallJSON functions it would be extremely useful to have access
to the unquote, and unquotebytes functions from decode.go

[remyoudompheng]

Comment 1:

Can't you already get the same result using the following snippet?
var s string
err := json.Unmarshal(quoted_string, &s) 
...

[rsc]

Comment 2:

Please use Unmarshal.
We should make sure it is not too slow.

Labels changed: added priority-later, removed priority-triage.

Status changed to Accepted.

[rsc]

Comment 3:

Labels changed: added go1.1.

[rsc]

Comment 5:

Labels changed: added size-m.

[rsc]

Comment 6:

Labels changed: added suggested.

[gopherbot]

Comment 7 by rickarnoldjr:

https://golang.org/cl/7068043/

[bradfitz]

Comment 8:

This issue was closed by revision 60abc6b.

Status changed to Fixed.

[rsc]

Comment 9:

Rolling back in CL 7228061: breaks unmarshal of malformed JSON.

Status changed to Accepted.

[rsc]

Comment 10:

This issue was closed by revision eea0f19.

Status changed to Fixed.

[rsc]

Comment 11:

This second attempt breaks when custom decoders are used and fail. See issue #4784. Going
to roll this back and mark this working as intended. The existing paths are fast enough.

Status changed to WorkingAsIntended.