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Clarified string interpolation with single component #329

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Clarified string interpolation with single component #329

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7 changes: 4 additions & 3 deletions spec.md
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Expand Up @@ -2356,9 +2356,10 @@ it is immediately followed by another `%`, in which cases both
characters together denote a single literal percent sign.

The conversion's operand is the next element of `args`,
which must be a tuple with exactly one component per conversion,
unless the format string contains only a single conversion, in which
case `args` itself is its operand.
which must be a tuple with exactly one component per conversion.
If a single conversion is required, `args` may be a single non-tuple object.
In order to format a single component with a single tuple,
`args` must be a tuple whose only element is the tuple to be represented.

Starlark does not support the flag, width, and padding specifiers
supported by Python's `%` and other variants of C's `printf`.
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