fix: getGlyph() on the last glyph results in incorrect "missing glyph" #116
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I ran into this issue when using a code128 barcode font (https://github.com/Holger-Will/code-128-font/blob/master/fonts/code128_L.ttf to be specific). The last glyph of the barcode never rendered and resulted in a "missing glyph" warning.
This PR fixes that (and likely explains the original
# n+1 !?comment).