qiskit/releasenotes/notes/0.19/full_prec_sympy-aeee8210091...

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The string cast for :class:`qiskit.circuit.ParameterExpression` does not
have full precision anymore. This removes the trailing 0s when printing
parameters that are bound to floats. This has consequences for QASM
serialization and the circuit text drawer::
>>> from qiskit.circuit import Parameter
>>> x = Parameter('x')
>>> str(x.bind({x:0.5}))
'0.5' # instead of '0.500000000000000'