Line Break - Infix Numeric Separator

Infix Numeric Separator is a line break class that defines how certain punctuation marks, like commas, periods, or middle dots, behave when they appear between numeric digits. These separators are treated as inseparable from the digits on either side, meaning a line cannot break immediately before or after the separator, but it may break after a following digit. This ensures that numbers written with grouping or decimal separators, such as "1,234.56" or "3.14", remain visually intact on a single line, preventing awkward splits that could confuse the value. The class also allows for a break after the separator itself if the following character is not a digit, though in typical numeric contexts, the separator clings to the preceding number. This behavior helps maintain clarity in financial, scientific, and other data-heavy text.