.. change::
    :tags: bug, oracle
    :tickets: 4913

    The :class:`.sqltypes.NCHAR` datatype will now bind to the
    ``cx_Oracle.FIXED_NCHAR`` DBAPI data bindings when used in a bound
    parameter, which supplies proper comparison behavior against a
    variable-length string.  Previously, the :class:`.sqltypes.NCHAR` datatype
    would bind to ``cx_oracle.NCHAR`` which is not fixed length; the
    :class:`.sqltypes.CHAR` datatype already binds to ``cx_Oracle.FIXED_CHAR``
    so it is now consistent that :class:`.sqltypes.NCHAR` binds to
    ``cx_Oracle.FIXED_NCHAR``.


