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seen Jan 19 at 22:32

comment UNIX timestamp (= seconds since 1/1/1970) in document?
Did you not notice which stackexchange this is? Your answer isn't exactly TeX-relevant.
comment Did the “Computer Modern” font families become a default because they're well tested and proven, or chance?
If page breaks are the concern, wouldn't it suffice to have the same metrics?
comment How do I write a recurring decimal in LaTeX?
@Egon How would you write 1.23453(45)? As "1.234534545..."?
comment Why are URLs typeset with monospace fonts by default?
It depends on the type of URL you are using. We have the luxury that URLs used today tend to be as easy as plain text to infer the usage of 1 vs l vs I from context. Even non-"coding-font" monospace fonts tend to distinguish well between the three due to the need to expand serifs to fill horizontal space.
comment Ligatures: why “fi”, but not “fj” as well?
@barbarabeeton why do glyphs have to be identified based on unicode (or pua) at all? I'm saying each glyph could have an arbitrary id (a=1 b=2 c=3 d=4 e=5 f=6 fi=7 fj=8 g=9, say), some of these are mapped to code points (but not fj), and some are in the ligature table (both fi and fj). There doesn't need to be an "alternative", because the need to have a code point to identify it doesn't exist at all.
comment Ligatures: why “fi”, but not “fj” as well?
@tohecz The symbols like "fi" in unicode are only there because they were present in older encodings (like adobe or apple) that had more limitations. Modern systems don't need a "fj" character to have a "fj" glyph in the font. If they were absent, we could still have a "fi" ligature that is only used by using the two letters normally.
comment Ligatures: why “fi”, but not “fj” as well?
I don't see how it "guarantees that use of the private use area is unavoidable" - fonts aren't required to assign code points to all their glyphs.