It's possible that you just have sharper eyes than I do; I have been getting older (a deadly habit I keep meaning to break, but the withdrawals seem prohibitive

It's possible that you just have sharper eyes than I do; I have been getting older (a deadly habit I keep meaning to break, but the withdrawals seem prohibitive). However, just to clarify, my point is not that these glyphs are indistinguishable when directly compared, but that they can mislead you while reading code. I can certainly tell them apart when I compare them. But can I immediately see that "e1" is "e-one", or that "42l" is the long integer 42? If not, having wasted hours on such stupid things, I would disqualify the font.