Unicode encodes these as separate codepoints for compatibility, but fonts use the same glyph. These are easy to handle (NFKC collapses them), but worth knowing about.
The false positives at the bottom
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[1] K. Lemström, J. Tarhio & T. Takala: “Color Dithering with n-Best Algorithm” (1996). ↑
Жители Санкт-Петербурга устроили «крысогон»17:52