Serialization support of fieldpaths not comprehensive

[jpbetz]

During review of #292, a few pre-existing gaps in serialization support were noticed that we should really fix:

• Overflows are possible using the value interface's IsInt/AsInt. This could happen in an aggregated API server when the writer is proto and the value type is uint64, for example.
• Custom Marshalers (JSON or CBOR) not supported in any of the valueReflect (for aggregated, or in-tree for Quanity/Time for map key values)

Also there is this potential optimization:

• In serialize.go, we could optimize for "out of sorted order".

[jpbetz]

cc @liggitt @benluddy @deads2k @lalitc375

[jpbetz]

cc @inteon

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/lifecycle stale

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/lifecycle rotten

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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

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In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

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/close not-planned

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