FromStream set each Resource's Bytes to scanner.Bytes(), which aliases
the bufio.Scanner's internal buffer. Resources are emitted on a channel
and retained/parsed by the consumer concurrently with the producer
goroutine; when the scanner refills its buffer for later documents it
overwrites the slices earlier Resources still point at. Consumers that
parse resources as they arrive (e.g. ValidateWithContext) then read
corrupted bytes — a later document spliced into the one being parsed —
surfacing as non-deterministic YAML parse errors on large multi-document
streams (a different resource fails on each run).
Clone the scanner bytes so each Resource owns its slice. Adds a
regression test that streams >4MB (forcing the scanner to refill) and
asserts every resource's bytes are intact after draining.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
