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From: https://github.com/chrissimpkins/Hack/blob/master/CHANGELOG.md
Version 2.020
divided the vertical stroke in the pipe glyph (U+007C), italic and bold italic sets
modified U+007C hints in TrueType builds at 6, 7, 10, 11, 12, 13, 14 ppem italic set
modified U+007C hints in TrueType builds at 6, 7, 10, 14 ppem bold italic set
modified slant angle and stroke length (U+005C), italic and bold italic sets
centered U+007C and U+005C, all sets
modified zero (U+0030) oval fill hints in regular set
added Powerline glyphs to the bold, italic, and bold italic sets
U+2502 upper terminal to 1950, lower terminal to -530, all sets
U+2503 upper terminal to 1950, lower terminal to -530, all sets
U+250C lower terminal to -530, all sets
... (more too many lines ommitted) ...