Parcel layer tweaks

[hkaiser]

@JiakunYan these are some tweaks to the parcel layer as discussed. Please verify.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ -0.33%	✅ 64.71%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (e47a884)	206733	176202	85.23%
Head commit (c824fbd)	195604 (-11129)	166069 (-10133)	84.90% (-0.33%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#6435)	51	33	64.71%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[hkaiser]

I think we can go ahead and merge this.