[SR-6314] Swift will not deserialize a JSON object with unicode character FEFF as property name

[swift-ci]

Previous ID	SR-6314
Radar	None
Original Reporter	mark.probst (JIRA User)
Type	Bug

Attachment: Download

Environment

Apple Swift version 4.0.2 (swiftlang-900.0.69.2 clang-900.0.38)

Target: x86_64-apple-macosx10.9

Additional Detail from JIRA

Votes	0
Component/s	Foundation
Labels	Bug, Codable
Assignee	None
Priority	Medium

md5: 3dc0fb1b6152165425ac5ac8aad629d6

Issue Description:

I'm trying to decode a JSON object that has a property whose name is the sole unicode character FEFF, which does not work. 200B works, for example. This is the type:

struct TopLevel: Codable {

{{ let empty: String}}

{{}}}

extension TopLevel {

{{ enum CodingKeys: String, CodingKey {}}

{{ case empty = "\u{feff}"}}

}

{{}}}

and this is the JSON:

{

{{ "\ufeff": "foo"}}

{{}}}

I've attached a test case. Compile it and invoke it with

./a.out blns-object.json

[belkadan]

I would guess it's being interpreted as a byte-order mark rather than as content. Hm.