[vjik]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[Copilot]

🟢 Approval recommended

The narrow URI guards preserve existing behavior, and regression tests cover filename detection and both upload transports.

No open issues 🎉

What changed in this PR

Fixes undefined-array-key errors when uploading stream resources whose metadata has no URI, while preserving existing handling of file paths and URI-backed streams.

Changes:

• Guard missing URI metadata in filename detection and cURL upload handling.
• Add socket-based regression tests for InputFile and both upload transports.
• Document the bug fix in the changelog.

File	Description
tests/​Type/​InputFileTest.php	Tests filename and extension detection for streams without a URI.
tests/​Transport/​NativeTransport/​NativeTransportTest.php	Tests native uploads using streams without a URI.
tests/​Transport/​CurlTransport/​CurlTransportTest.php	Tests the string-file upload fallback for streams without a URI.
tests/​Support/​TestHelper.php	Adds a shared socket-pair helper for regression tests.
src/​Type/​InputFile.php	Returns no inferred filename when URI metadata is absent.
src/​Transport/​CurlTransport.php	Guards URI access before selecting file-based uploads.
CHANGELOG.md	Records the stream metadata bug fix.

_{Review effort: Balanced}