[SR-10321] Expose support in PropertyListEncoder and PropertyListDecoder for converting to/from a plist instead of Data

[tjw]

Previous ID	SR-10321
Radar	rdar://problem/35469406
Original Reporter	@tjw
Type	Bug

Additional Detail from JIRA

Votes	0
Component/s	Foundation
Labels	Bug, Codable
Assignee	bendjones (JIRA)
Priority	Medium

md5: 6a6e7c98fd73328b0660b63bb80dad10

Issue Description:

PropertyListEncoder should have an `encode` variant that produces the non-serialized property list, and PropertyListDecoder should have a `decode` variant that takes as input a n already-deserialized property list.

This would allow better reading/writing UserDefaults values and allow UserDefaults to do the serialization operations, and importantly, allowing the command line tool `defaults` `read` option to produce human-readable output and the `find` option to actually be able to see the property list contents.

[belkadan]

bendjones (JIRA User), I know Apple has a Radar for this, but maybe this is the first JIRA?

[swift-ci]

Comment by Ben D. Jones (JIRA)

Possible let me look around...

[swift-ci]

Comment by Ben D. Jones (JIRA)

@belkadan associated the radar