ker DegreeLimit silently truncates when the ring map is not homogeneous
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Description
If we know that the kernel of a ring map is generated in degree d, then we should be able to tell M2 that info. This issue is from the ask mike session at the M2 day at Fields, Oct 21, 2016.
```
R = ZZ/32003[a..d]
S = ZZ/32003[s,t]
phi = map(S,R,{s^4, s^3*t, s*t^3, t^4})
ker(phi, DegreeLimit=>3)
```
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