Target ranges stayed canonical while every reading surface moved to the
metric/imperial preference in the previous release, so an imperial
account saw a weight chart in pounds above a target reference in
kilograms. The panel is a coupled display and edit unit: converting only
its display would have corrupted the edit seed and the save round-trip,
which is why it was held back.
Add one adapter that owns every direction of the conversion and route
all three surfaces through it. The reference panel converts the
canonical payload once and hands the converted pair to the range bar,
the status pill, and the editor seed. The editor seeds from the stored
value converted to the display unit, validates against guardrails
projected into that same unit, and inverts the typed number back to
canonical before the PUT.
Guardrails round inward, so the 30 kg floor projects to 66.2 lb rather
than 66.1 lb, which would have inverted below the floor the server
enforces. Absolute values carry the affine offset, differences take the
factor alone. Input step comes from the transform's own precision.
Storage is untouched: thresholds stay canonical SI, and for a metric
account the adapter is the exact identity in both directions, so a
stored value is unchanged bit for bit.
Marc-André Bombeck
bf73755899