Merge changes from topic "cherrypicker-L76600000960405157:N45800001364684986" into tm-mainline-prod

* changes:
  pdl: Avoid unwrap when parsing arrays
  pdl: Propagate child errors from Packet::new
  pdl: Propagate parse errors to callers
  pdl: Use explicit type when converting enum value
  pdl: Make primite enums repr(u64) again