Highlighted text in failure messages is bold instead of bright white,
gray is the real gray instead of bold black, and passed tests in
console-lines mode are no longer printed in silver.

When the one-line dump of arrays or objects hides the difference (nested
[...], truncated lists, object hashes), the failure message gets a line
with the path to the first differing item, e.g.

at ['fields'][4]: 'foo' should be 'bar'

equal() descends into properties of objects and skips back-references.

Failure messages now read %% as a literal %, so that values in the path
line containing %1 or %2 (as in url-encoded %20) are not replaced.

Without vendor/ it knows nothing of the classes of the libraries, so a call of a deprecated method passes unnoticed.

A method-level data provider returning an empty array or an empty
Traversable made runTest() return without calling the test method, and
run() printed a passing mark. It now throws TestCaseException, the same
way as an empty file-level data provider fails the test.

Method-level annotations only; attributes take precedence over the docblock,
which stays fully functional. File-level .phpt annotations cannot be replaced
(no file-level attributes in PHP, runner reads them statically before spawn).

Arguments were formatted by toLine(), whose string encoding emits the actual
character after the \n, \r and \t escapes and toggles bold around them, meant
for assertion messages. In a stack trace this split frames over multiple lines
and left the rest of the frame bold. Arguments now use a plain variant: strings
are encoded as PHP literals, exceptions and Expect are shown as objects, without
their possibly multiline message or dump.