appendToolCallArgumentDelta() treated any non-string incoming fragment as
empty, silently dropping tool-call arguments delivered as an already-parsed
JSON object/array (a non-conformant shape some upstreams emit for
tool_calls[].function.arguments) instead of JSON-encoding them. This left
tool_use.input empty on the /anthropic streaming path and opened the door to
downstream [object Object] string coercion once buffers were concatenated.
Now JSON.stringify()s the non-string fragment instead of discarding it.
Release v3.8.24 — see CHANGELOG.md [3.8.24] for the full notes and the PR description for the contributors hall. Integration of release/v3.8.24 into main.
