Problem:    Minor typos.
Solution:   Fix the typos. (Christian Brabandt, closes #8441)

Problem:    Vim9: not all blob operations work.
Solution:   Run more tests also with Vim9 script and :def functions.  Fix what
            doesn't work.

Problem:    Vim9: blob tests for legacy and Vim9 script are separate.
Solution:   Add CheckLegacyAndVim9Success().  Make blob index assign work.

Problem:    Vim9: not all tests cover script and :def function.
Solution:   Run tests in both if possible. Fix differences.

Problem:    Vim9: divide by zero does not abort expression execution.
Solution:   Use a "failed" flag. (issue #7704)

Problem:    Vim9: test leaves file behind.
Solution:   Rename script files. (Dominique Pellé, closes #7511)
            Use try/finally.

Problem:    Vim9: unpredictable errors for script tests.
Solution:   Use a different script file name for each run.

Problem:    Vim9: trinary operator condition is too permissive.
Solution:   Use tv_get_bool_chk().

Problem:    Vim9: cannot assign 1 and 0 to bool at script level.
Solution:   Add the TTFLAG_BOOL_OK flag to the type. Fix name of test
            function.

Problem:    Vim9: cannot assign to local option.
Solution:   Skip over "&l:" and "&g:". (closes #6749)