[tex-k] Version numbers in TeXbook and MFbook

[Igor Liferenko]

Hi all,

tex.web:
% Version 3.141 more of same; reconstituted ligatures better (March 1992).
texbook.tex:
This is TeX, Version 3.141 (preloaded format=plain 89.7.15)

mf.web:
% Version 2.0 fixed bug in addto; released with TeX version 3.0 (March 1990).
mfbook.tex:
This\\is\\METAFONT,\\Version\\2.0\\(preloaded\\base=plain 89.11.8)}
This is METAFONT, Version 2.0 (INIMF)  8 NOV 1989 10:09

How can it be that versions which were not released yet appear in the
program output?

Greetings,
Igor