Proposal: add unit system metadata - #148
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August 2, 2026 12:39
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Summary
unit systemmetadata keymetric,imperial, andus customarysource-system valuesMotivation
Cooklang supports serving-based scaling, but clients do not have a portable source-system hint for unit conversion. This proposal lets recipe authors distinguish systems such as British Imperial and US customary while leaving conversion tables, rounding, target units, and presentation policy to each client.
This addresses #142.
Impact
The proposal does not change Cooklang grammar or require clients to implement conversion. Existing parsers can expose the key through generic YAML metadata, and clients without conversion support continue rendering recipes unchanged.
Full Proposal