Tests (chan)io-34.21 are constrained for largefileSupport, and that's
disabled by default, which means never tested, which means the ridiculous
bugs in them are never found and fixed.

Fixed the bugs, changed the default.  Large File Suppport (4GB) is
commonplace now.  Let those without it suffer a few failing tests reporting
that fact to them.
Tests (chan)io-34.21 are constrained for largefileSupport, and that's disabled by default, which means never tested, which means the ridiculous bugs in them are never found and fixed.

Fixed the bugs, changed the default. Large File Suppport (4GB) is commonplace now. Let those without it suffer a few failing tests reporting that fact to them.
Added comment explaining the "knownBug" in iogt-6.1
Added comment explaining the "knownBug" in iogt-6.1
Correct namespace bugs in normally skipped tests.
Constrain them as "knownBug" rather than "unknownFailure".
Correct namespace bugs in normally skipped tests. Constrain them as "knownBug" rather than "unknownFailure".
Repair another "impossible" test and the segfault it reveals.
[6d2f249a01] Handle a failure to ccomprehend half-way through the compilation of a chain of compileable ensembles.
Have the [chan push] machinery ReadRaw() directly into the argument to be
passed to the read method of the channel transformation command.  Save a copy.
Restore the largefileSupport constraint on Darwin, where tests (chan)io-34.21
take an unbearable 90 seconds each to complete.
Restore the largefileSupport constraint on Darwin, where tests (chan)io-34.21
take an unbearable 90 seconds each to complete.
[958bc05fbe]: Clarify "clock format" using "%R"
[958bc05fbe]: Clarify "clock format" using "%R"
Fix 3 test-cases which started failing on Windows
Fix 3 test-cases which started failing on Windows
Fix [3118489]: NUL in filenames. (On Windows, protect against invalid use of ':' in filenames as well)
Minor bug-fix in [3118489] implementation: NUL in filenames. Filenames starting with <drive>: but without a following slash should be considered volume-relative i.e. the ':' is valid here.
Portable test to demo bug otherwise seen only on Windows.
Branch to demo bug introduced in the parent commit.
More tests to demo the bug more directly.