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[SR-15036] JSONEncoder sometimes encodes dictionaries as arrays #3206

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franklinsch opened this issue Aug 6, 2021 · 1 comment
Open

[SR-15036] JSONEncoder sometimes encodes dictionaries as arrays #3206

franklinsch opened this issue Aug 6, 2021 · 1 comment
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@franklinsch
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Previous ID SR-15036
Radar rdar://81606906
Original Reporter @franklinsch
Type Bug
Environment

Ubuntu 18.04 using the toolchain swift-5.5-DEVELOPMENT-SNAPSHOT-2021-08-04-a-ubuntu18.04, which has:

Swift version 5.5-dev (LLVM 4afce2110750060, Swift 4ae44a5e0eac8a0)
Target: x86_64-unknown-linux-gnu

Additional Detail from JIRA
Votes 0
Component/s Foundation
Labels Bug
Assignee None
Priority Medium

md5: 89b9b09cfba7115d37589ea5171b1014

Issue Description:

For the following program:

public struct DataAsset: Codable {
    public var sizes = [ImageSize: String]()
}

public struct ImageSize: Codable, Hashable {}

let data = try! JSONEncoder().encode(DataAsset(sizes: [ImageSize(): ""]))
print(String(data: data, encoding: .utf8)!)

The output I'm getting is `{"sizes":[{},""]}` on Linux (sizes should be a dictionary instead), which is unexpected. On macOS I'm getting `{"sizes": {}}`.
@YOCKOW
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YOCKOW commented Aug 15, 2021

Surprisingly, the behavior on Linux seems to be correct because of SR-7788.

EDIT: Swift 5.4.2 on macOS emits the same result with Linux.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
@shahmishal shahmishal transferred this issue from apple/swift May 5, 2022
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@franklinsch @YOCKOW