kagefunc.hardsubmask but cool

def dehardsub(waka, cr, thr=2000, rad=4, min_rad=1, fill_gaps=6, inflate=3, sigma=24, fade_compensate=2, expand_subs=None, expand_ts=0):
    from kagefunc import hardsubmask
    from vsutil import depth, iterate
    from string import ascii_lowercase
    from functools import partial

    waka, cr = [depth(x, 16) for x in (waka, cr)]
    hsm = hardsubmask(waka, cr, expand_n=None)
    mask = [waka, cr]

    # give it a good wipe
    if sigma:
        mask = [x.dfttest.DFTTest(sigma=24, tbsize=1) for x in mask]

    # could make this accept separate values for chroma?
    mask = core.std.Expr(mask, f'x y - abs {thr} > 255 0 ?', vs.YUV420P8)

    # i dont think Median is even remotely necessary given what comes next
    # but its here and idr why so... if it ain't broken...
    mask = mask.std.Median().resize.Point(format=vs.YUV444P8)
    mask = core.std.Expr(split(mask), 'x y z max max')

    # i could feel my brain getting bigger as I wrote this
    rad -= min_rad
    mask = iterate(mask, core.std.Minimum, min_rad)
    x = iterate(mask, partial(core.std.Minimum, coordinates=[0,0,0,1,1,0,0,0]), rad)
    x = iterate(x,    partial(core.std.Maximum, coordinates=[0,0,0,1,1,0,0,0]), rad)
    y = iterate(mask, partial(core.std.Minimum, coordinates=[0,1,0,0,0,0,1,0]), rad)
    y = iterate(y,    partial(core.std.Maximum, coordinates=[0,1,0,0,0,0,1,0]), rad)
    mask = core.std.Expr([x, y], 'x y max')
    mask = iterate(mask, core.std.Maximum, rad + min_rad + fill_gaps + expand_ts)
    mask = iterate(mask, core.std.Minimum, fill_gaps)
    mask = iterate(mask, core.std.Inflate, inflate)

    # a list of clips of adjacent frames where only the center clip has the black/white hardsubs (i.e. no TS or fades)
    TS = core.std.Expr([mask, hsm], 'x y -')
    fade = []
    for x in range(-fade_compensate, fade_compensate + 1):
        if x < 0:
            fade += [TS[0] * abs(x) + TS[:-x]]
        elif x == 0:
            fade += [mask]
        else:
            fade += [TS[x:] + TS[-1] * x]

    # take the max of the clips
    # blatant plain-text subs arent extended because only the center clip has them
    abc = 'z'+ascii_lowercase.rstrip('xyz')
    var, op  = [''] * 2
    for x in range(fade_compensate * 2):
        var += ' {} '.format(abc[x])
        op += ' max '
    mask = core.std.Expr([hsm, mask] + fade, f'x y {var} {op} 257 * max')

    return waka.std.MaskedMerge(cr, mask)