Vector version of DetectorMap.findPoint fails

dataId = dict(visit=47, arm="r", spectrograph=1)
pfsArm = butler.get("pfsArm", dataId)
detMap = butler.get("detectorMap", dataId)

detMap.findPoint(pfsArm.fiberId[0], pfsArm.wavelength[0][0])    # succeeds
detMap.findPoint(pfsArm.fiberId[0], pfsArm.wavelength[0][0:2])  # fails

TypeError: findPoint(): incompatible function arguments. The following argument types are supported:
    1. (self: pfs.drp.stella.DetectorMap.DetectorMap, fiberId: int, wavelength: float) -> lsst.geom.Point2D
    2. (self: pfs.drp.stella.DetectorMap.DetectorMap, fiberId: int, wavelength: ndarray::Array<float, 1, 1>) -> ndarray::Array<float, 2, 1>
    3. (self: pfs.drp.stella.DetectorMap.DetectorMap, fiberId: ndarray::Array<int, 1, 1>, wavelength: ndarray::Array<float, 1, 1>) -> ndarray::Array<float, 2, 1>

Invoked with: <pfs.drp.stella.SplinedDetectorMap.SplinedDetectorMap object at 0x2b3b8add2928>, 2, array([620.33496, 620.4214 ], dtype=float32)