Released
v1.17.0!
A fair amount of goodies in this one

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Error handling in the CLI tool is now extra verbose.
In the OT/TTF font rendering codepath, you can now get information about the line-breaking computation pass (c.f., the docs and the discussion in the Kobo FBInk thread).
Also on the OT/TTF side of things, the font size can now be specified as a decimal, which should allow finer-grained control over the final rendering

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On the fixed-cell font rendering side of things, Spleen has been updated to 1.0.5, and a couple of Amiga fonts have been imported (Topaz+ A1200 & MicroKnight+), as well as the VGA variant (8x16) of the IBM font.
The LF glyph is now always replaced by a space, to account for fonts where it is visible.
There's a bunch of minor performance improvements all over, but especially for the fixed-cell font rendering.
Of particular interest to users of legacy (< K4) Kindle devices (hi, @PoP!

), this one finally fixes a bunch of issues related to the quirkiness involved with dealing with a 4bpp framebuffer.
The most visible example I could find was overlay mode, in the fixed-cell font rendering, with an odd font scaling multiplier. It'd lead to bogus colors on the edges of glyphs.
(While it affected more stuff, the most common codepaths were using a couple of workarounds to paper over the underlying issue ;p. This release fixes it for good).