DeHalo_alpha: Fix 32-bit float support

havsfunc.py

@@ -407,7 +407,7 @@ def DeHalo_alpha(clp, rx=2.0, ry=2.0, darkstr=1.0, brightstr=1.0, lowsens=50, hi
     halos = clp.resize.Bicubic(m4(ox / rx), m4(oy / ry), filter_param_a=1/3, filter_param_b=1/3).resize.Bicubic(ox, oy, filter_param_a=1, filter_param_b=0)
     are = core.std.Expr([clp.std.Maximum(), clp.std.Minimum()], expr=['x y -'])
     ugly = core.std.Expr([halos.std.Maximum(), halos.std.Minimum()], expr=['x y -'])
-    expr = f'y x - y 0.000001 + / {peak} * {scale(lowsens, peak)} - y {scale(256, peak)} + {scale(512, peak)} / {highsens / 100} + *'
+    expr = f'y x - y y 0 = + / {peak} * {scale(lowsens, peak)} - y {scale(256, peak)} + {scale(512, peak)} / {highsens / 100} + *'
     so = core.std.Expr([ugly, are], expr=[expr])
     lets = core.std.MaskedMerge(halos, clp, so)
     if ss <= 1: