towards passing the arithmetic-conversion tests

See #264, release log:

• 468ec89 by @dours: Merge pull request #264 from p...
• 8a565d8 by @dours: fix wrong path in CI
• efed8d2 by @dours: Merge remote-tracking branch '...
• f959eb2 by @dours: forgotten
• acad212 by @dours: Merge branch 'master' into for...
• a4666f9 by @dours: update EO compiler version
• 8dcd74b by @dours: need to compile the preface ...
• 9c2774e by @dours: now a python code is wrapped i...
• 05c58dc by @dours: add .as-string to builtin type...
• eeedaeb by @dours: an attempt to add __class__ ...
• a90ecce by @dours: fix a style problem
• f32f7ac by @dours: fix a style problem
• 6aacf56 by @dours: support printing of EO objects...
• 32d33ea by @dours: workaround a crash of the styl...
• 7ce4156 by @dours: extract an object, which is us...
• 40cc123 by @dours: Update README.md
• 8c31235 by @dours: Update README.md
• e3819f7 by @dours: Update README.md
• 117234e by @dours: wrap bool string int and float...
• 64f0209 by @dours: Update README.md
• and 1 more...

Released by Rultor 1.70.6, see build log