Number Format

Render a number in a named presentation style at a chosen precision — the numeric sibling of DateFormat. Scaling happens INSIDE the formatter, so a stored NAV fraction like 0.0696 renders as 6.96% with no author-side multiplication and therefore no binary floating-point artifact: hand-multiplying by 100 first yields 6.959999999999999, whose length is unbounded and can overflow a fixed-viewBox tile. Returns the empty string when the source is absent or not numeric, so authors can wrap the result in a Fallback the same way they do for DateFormat.