v0.1.2

Fixed

• Exact scalar reduction during sum/product operations to prevent underflows/overflows of int32 on large diagrams. Unfortunately, this change comes with a 2x performance overhead, but results in more stable numerical results (#93)
• Normalization issues for circuits with arbitrary rotation gates now raise a warning instead of an error (#91)
• Parsing errors for invalid Stim circuits now raise useful exceptions (#91)

Added

• SPP and SPP_DAG instructions — generalized S gate that phases the -1 eigenspace of Pauli product observables by i or -i. Supports multi-qubit Pauli products and inverted targets (#97)
• MXX, MYY, MZZ two-qubit parity measurement instructions, delegating to existing MPP infrastructure. Also adds II_ERROR support (#96)
• MPAD instruction for padding the measurement record with fixed bit values (#95)