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Define function composition for :string values #798

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8 changes: 8 additions & 0 deletions spec/registry.md
Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,14 @@ The `:string` function returns the string value of the _resolved value_ of the _
> Users SHOULD encode _messages_ and their parts in Unicode Normalization Form C (NFC)
> unless there is a very good reason not to.

#### Composition

When an _operand_ or an _option_ value uses a _variable_ annotated,
directly or indirectly, by a `:string` _function_,
its _resolved value_ contains the string value of the _operand_ of the annotated _expression_,
together with its resolved locale and directionality.
None of the _options_ set on the _expression_ are part of the _resolved value_.

## Numeric Value Selection and Formatting

### The `:number` function
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