When code blocks are nested within list items with CommonMark's 7-space (3+4=7) indentation rule, remark fails to recognize the code blocks and treats them as nested paragraphs in the list item rather than <code>.

Steps to reproduce

This CommonMark playground example shows how CommonMark handles nested code blocks within list items with various indentations.

TL;DR: CommonMark recognizes 7-space indents as code blocks in single-digit ordered list items.

Expected behaviour

The parsed remark AST should be same as the result in the CommonMark playground.

Actual behaviour

The remark parser fails to recognize CommonMark's (3+4=7) indentation for code blocks within list items and treats them as nested paragraphs in the list item rather than <code>.

This Prettier playground example shows how remark stumbles on the 7-space indentation.

(See prettier/prettier#3459 for the initial discussion and additional examples.)