:func:`.make_url` function **no longer URL encode the password**.
Database passwords that include characters like spaces, plus signs
and anything else should now represent these characters directly,
without any URL escaping. [ticket:2873]

so that __repr__() is maintained (for alembic tests)

to descriptors, like hybrids, synonyms, composites, user-defined
descriptors, etc.  The attribute
adaptation which goes on has been made more robust, such that if a descriptor
returns another instrumented attribute, rather than a compound SQL
expression element, the operation will still proceed.
Addtionally, the "adapted" operator will retain its class; previously,
a change in class from ``InstrumentedAttribute`` to ``QueryableAttribute``
(a superclass) would interact with Python's operator system such that
an expression like ``aliased(MyClass.x) > MyClass.x`` would reverse itself
to read ``myclass.x < myclass_1.x``.   The adapted attribute will also
refer to the new :class:`.AliasedClass` as its parent which was not
always the case before. [ticket:2872]

Python ``Decimal`` via string is now configurable.  The
flag ``decimal_return_scale`` is now supported by all :class:`.Numeric`
and :class:`.Float` types, which will ensure this many digits are taken
from the native floating point value when it is converted to string.
If not present, the type will make use of the value of ``.scale``, if
the type supports this setting and it is non-None.  Otherwise the original
default length of 10 is used. [ticket:2867]

when a pre-DBAPI :class:`.StatementError` were raised within
:meth:`.Connection.execute`, causing encoding errors for
non-ASCII statements.  The stringification now remains within
Python unicode thus avoiding encoding errors. [ticket:2871]

(e.g. for a ``CAST`` or similar) would incorrectly render ``None CHAR``
or similar. [ticket:2870]

correctly with table or column names that contain non-ASCII
characters. [ticket:2869]