qiskit/releasenotes/notes/0.19/more-forgiving-numeric-conv...

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features:
- |
:obj:`~qiskit.circuit.ParameterExpression` now delegates its numeric
conversions to the underlying symbolic library, even if there are
potentially unbound parameters. This allows conversions of expressions such
as::
>>> from qiskit.circuit import Parameter
>>> x = Parameter('x')
>>> float(x - x + 2.3)
2.3
where the underlying expression has a fixed value, but the parameter ``x``
is not yet bound.