Unexpected result with SkParagraph.getRectsForRange

[sighmun]

First, thanks for this great library, really enjoying using it!

I'm trying to get the bounding boxes of each glyph in some text and getRectsForRange sounds like it would do exactly what I want:

(method) SkParagraph.getRectsForRange(start: number, end: number): SkRect[]
Returns the bounding boxes of the glyphs in the given range. This method requires the layout method to have been called first.
@param start — Start index of the range
@param end — End index of the range

According to that description I'd thought this function would return an array with the number of elements equivalent to the glyphs in the substring specified by the start and end index params, but instead I get either 1 or 2 array elements.

For example:

const text = 'simple';
const p = Skia.ParagraphBuilder.Make(paragraphStyle, fontMgr)
  .pushStyle(textStyle)
  .addText(text)
  .pop()
  .build();
p.layout(width);
const rects = p.getRectsForRange(0, text.length - 1);
// returns a single element array like [{ height: 19, width: 39.02000045776367, x: 0, y: 0.25 }]

Am I using this wrong, or misunderstanding how it's supposed to work? Appreciate anyone taking a look!