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Review decimal marks, grouping and negative numbers

This is a fixed-example checklist. It does not read real data or files. Review the difference between display and meaning before handing a number to another locale; it does not auto-convert or infer a locale.

Fixed exampleOnly five fixed cases are rendered in the browser. There is no file upload, storage or transmission.

Review points

Example	Display	Class	Handoff caution
English style	1,234.56	decimal + grouping	Separate decimal and grouping marks
German style	1.234,56	decimal + grouping	Confirm the locale with the recipient
Negative	-1,234.50	negative	Do not drop the sign
Empty	empty	empty	Do not treat it as zero
Ambiguous	1,234	ambiguous	Do not infer automatically