Changes in version 1.3.0 (2026-10-04)                  

  - Fixed: open_nl() passed loss and freq to the maximum power output
    calculation by position, so they landed in unused arguments and the
    MPO never included the conductive component of a mixed or conductive
    loss. Results for purely sensorineural losses are unchanged.

  - Fixed: open_nl() called without loss returned its starting
    rule-based gains without optimizing. The missing loss was passed to
    sii() inside the objective function, where it caused an error that
    was caught and scored as a constant, so Nelder-Mead never moved. A
    missing loss is now treated as no conductive loss. Calls that
    supplied loss were not affected.

  - The Johnson & Dillon (2011) desensitization option is now named
    "johnson2011_desensitized" in sii() and open_nl(). The old name
    "johnson2011_complete" still works but gives a deprecation warning.

  - Loudness is now computed by calculate_loudness_audmod(), a C++ port
    of the AUDMOD model (Bramslow, 2004) that matches the Auditory
    Modeling Toolbox (AMT 1.6.0) bramslow2004 implementation at every
    stage. Tests compare it against AMT reference output for 23 cases.

  - open_nl() gains objective_sii, which selects the SII the optimizer
    maximizes. The default is "johnson2011_desensitized", the Johnson &
    Dillon (2011) desensitization correction; "none" optimizes the ANSI
    S3.5 SII.

  - Removed the desensitization_scale argument from sii() and open_nl().
    Desensitization is now either off ("none", ANSI S3.5 SII) or the
    full Johnson & Dillon (2011) correction
    ("johnson2011_desensitized"); there is no partial blend. Passing
    desensitization_scale is an error.

  - Removed the "johnson2011_smoothed" desensitization option (a
    product-form approximation, K * m) from sii() and open_nl(). The
    complete correction optimizes without difficulty, so the
    approximation is no longer needed. sii() now stops with an error for
    an unrecognized desensitization value instead of silently computing
    the ANSI SII.

  - open_nl() now optimizes a negative vent_floor once, at the floor
    requested. Previously it also optimized with the floor at 0 dB and
    returned whichever solution had the higher raw SII, so the requested
    floor was not always honored and differences between floors could
    never be negative.

  - sii() no longer floors a prescription_target's insertion gain at 0
    dB after output limiting. Negative insertion gain now lowers the
    speech level in the SII calculation, as it does in the loudness
    model; previously a gain cut below 0 dB was invisible to the SII.

  - Changed open_nl() default loudness cap to a normal-loudness cap. The
    new cap uses normal_speech_loudness() to dynamically compute the
    normal-hearing loudness of unaided speech at the evaluation level.
    The legacy behavior (PTA-based knots, reverse-slope penalty, and ABG
    adjustments) is still available via cap_rule = "legacy".