encoding/json: fix regression in quoted numbers under goexperiment.jsonv2
The legacy parsing of quoted numbers in v1 was according to
the Go grammar for a number, rather than
the JSON grammar for a number.
The former is a superset of the latter.
This is a historical mistake, but usages exist that depend on it.
We already have branches for StringifyWithLegacySemantics
to handle quoted nulls, so we can expand it to handle this.
Fixes #75619
Change-Id: Ic07802539b7cbe0e1f53bd0f7e9bb344a8447203
Reviewed-on: https://go-review.googlesource.com/c/go/+/709615 Reviewed-by: Damien Neil <dneil@google.com>
Auto-Submit: Joseph Tsai <joetsai@digital-static.net>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com> Reviewed-by: Michael Pratt <mpratt@google.com>