Eliminate protocol in favor of conditional printing in valAt
Revert "drop  in favor of the normal conj behavior"

This reverts commit a42de25ff7d16aae831b255c8a9bf85ca159d631.

Without `add-stratum`, the user cannot associate their own,
meaningful :id with the stratum.

Conflicts:
	src/matross/strata.clj
refactored some duplication