M4 uses ASCII character 0x60 as a left quote. Revisions of the ASCII standard have variously identified this character as "left quote-grave accent" and simply "grave accent", and have warned that it may have different interpretations internationally. Has this ambiguity affected the use of m4 outside the US? If so, how?
(An aesthetic effect, felt even in the US, is that left and right quotes may be quite unsymmetric, depending on the type font in which programs are rendered. This has the unfortunate side effect of deterring use of identical text for testing and for publication.) Doug
