ICU API proposal: Deprecate C createMetricTon/getMetricTon, J METRIC_TON

[Peter Edberg]

Dear ICU team & users,

I would like to propose the following API change for: ICU 78

Please provide feedback by: next Wednesday, 2025-03-26 (simple change, does not need a week)

Designated API reviewer: Rich G

Ticket: ICU-22142

Background:

• The mass unit “metric-ton" was introduced in CLDR 26; in CLDR 42 it was deprecated, and replaced with “tonne”.
• ICU 54 used data from CLDR 26, and:
• Added for C (i18n/unicode/measunit.h), createMetricTon (now @stable ICU 54).
• Added for J (main/core/src/main/java/com/ibm/icu/util/MeasureUnit.java), METRIC_TON (now @stable ICU 54).
• ICU 64 added for C (getXxx methods added to parallel createXxx): getMetricTon (now @stable 64).
• ICU 72 used data from CLDR 42, and:
• Added for C as draft: createTonne, getTonne (now @stable ICU 72).
• Added for J as draft: TONNE (now @stable ICU 72).
• Added a note for createMetricTon/getMetricTon/METRIC_TON that they are replaced by the methods/constants using Tonne/TONNE, and they would be deprecated in ICU 74 (when the Tonne/TONNE items would become @stable). However, that deprecation never happened.

Proposal: We should now finally deprecate the C methods createMetricTon/getMetricTon in favor of createTonne/getTonne and deprecate the J constant METRIC_TON in favor of TONNE.

- Peter

[Rich Gillam]

Definitely no objections from me…

—Rich

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