v6.1.0

• Widened the TypeScript signature of normalize. The runtime behavior is unchanged. Now normalize officially supports new Set([2, 1, 3]), etc., as an argument.
  • Before: normalize(data?: (number | Range)[] | number): MultiIntegerRange
  • After: normalize(data?: Iterable<number | Range> | number): MultiIntegerRange
• Set up tests for Node 26.