Brep.Split complete failure if one curve not on brep

@Helvetosaur wrote:

Why does Brep.Split completely fail if just one curve in a collection fails to split the brep?

import rhinoscriptsyntax as rs
import scriptcontext as sc
import Rhino, System
from System.Collections.Generic import IEnumerable


def SplitBrepWCrvs(brepID,crvIDs,tol,del_orig=True):
    brep=rs.coercebrep(brepID)
    crvs=[rs.coercecurve(crvID) for crvID in crvIDs]
    splits=brep.Split.Overloads[IEnumerable[Rhino.Geometry.Curve],System.Double](crvs, tol)
    if splits:
        if del_orig:
            rs.DeleteObject(brepID)
        return [sc.doc.Objects.AddBrep(brep) for brep in splits]

brepID=rs.GetObject("Select surface",8)
crvIDs=rs.GetObjects("Select curves",4)
tol=sc.doc.ModelAbsoluteTolerance
parts=SplitBrepWCrvs(brepID,crvIDs,tol)
if not parts: print "Failed!"
else: print "Surface split into {} parts".format(len(parts))

Select all the curves in the file below, it fails. Select only the black ones that go through the surface, it succeeds.
SplitSrfTest.3dm (318.5 KB)

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