qiskit/releasenotes/notes/1.3/fix-symbolic-unit-scaling-c...

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---
fixes:
- |
Fixed a floating-point imprecision when scaling certain pulse units
between seconds and nanoseconds. If the pulse was symbolically defined,
an unnecessary floating-point error could be introduced by the scaling
for certain builds of ``symengine``, which could manifest in unexpected
results once the symbols were fully bound. See `#12392 <https://github.com/Qiskit/qiskit/pull/12392>`__.