A numbered list usually needs a specific start value, step, and format, not a plain "1, 2, 3". Invoice line items that should start at 100. A step-by-step guide numbered by tens so items can be inserted later. IDs zero-padded to a fixed width. This prefixes every line with a sequential number built to exactly those specs.
When you'd use this
Turning a plain list into a numbered guide or invoice line-item list, or generating a sequence of zero-padded IDs (item-001, item-002 and so on) by pairing a custom separator with zero-padding.
Common errors
If the numbers don't line up the way you expect with zero-padding on, check that the padding width covers your largest number. Padding to 2 digits still lets a 3-digit number through unpadded; it won't truncate it, because truncating would silently lose data.
Frequently asked questions
Can I number by tens or skip values?
Yes. The step value controls the increment between lines, so it doesn't have to be 1. A start of 10 with a step of 10 gives you 10, 20, 30 and onward, which is handy for outline-style numbering where you want room to insert items later without renumbering everything.
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