Fatal error: DispatchIO was not closed

[barnard-b]

Describe the bug
When providing more than 64 KiB of input, the program will crash with Fatal error: DispatchIO <OS_dispatch_io: 0x...> was not closed.

To Reproduce

import Foundation
import Subprocess
import System

@main
struct App {
    static func main() async throws {
        let byteCount = 65537 // One less and it works.
        let data = Data([UInt8](repeating: 1, count: byteCount))
        let input = String(data: data, encoding: .ascii)!
        let result = try await run(
            .name("echo"),
            arguments: [ "Hello" ],
            input: .string(input),
            output: .string,
            error: .string
        )
        print(result)
    }
}

Expected behavior
Does not crash.

Environment (please complete the following information):

• Subprocess adc2749
• macOS 15.5
• Apple Swift version 6.1.2 (swift-6.1.2-RELEASE) Target: arm64-apple-macosx15.0