Replace the decimal or the parentheses

Warning²Federal courts, Illinois courts21st and 22nd editions

A section number keeps one convention throughout, as “§ 1485(a)(1)” rather than “§ 1485(a).1”: the source's own punctuation, or parentheses around every subsection, never both.¹

1. 1R. 3.3(a) Subsections.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.