Single-column BTree index crashes when filtering with Range

[DexterKoelson]

Calling .filter() or .delete() with a Range on a single-column BTree index throws:

SyntaxError: Cannot convert [object Object] to a BigInt

Example:

ctx.db.players.fooId.filter(
  new Range({ tag: 'included', value: 1n }, { tag: 'unbounded' })
);

The type system accepts Range<T> here (via IndexScanRangeBounds), but the runtime always serializes the argument as a point value. Multi-column indexes handle Range correctly — single-column indexes don't.