A subtle one: sort keys are compared by code point, not by…

A subtle one: sort keys are compared by code point, not by localeCompare.

function compareKeys(a: string, b: string): number {
  return a < b ? -1 : a > b ? 1 : 0;
}

Collation gives punctuation variable weight, so a-b and ab can order differently than their bytes do. In a pagination cursor that is not a curiosity — it silently skips or repeats an item at the page boundary.