GEOSGeometry treats WKB and WKT input differently (former fails)

[MatBurnham]

I've been trying to load an OpenStreetMap-derived multipolygon geometry from PostGIS but it fails due to trying to incorrectly load a non-closed shape into GeoDjango as a LinearRing. In trying to create a GEOSGeometry object manually from the same data, I identified a difference depending on the format presented - hex-encoded WKB fails in the way described; the same shape pre-converted in PostGIS to WKT works fine.

>>> from django.contrib.gis.geos import GEOSGeometry
>>> wkt = 'MULTIPOLYGON(((-0.45747735963738 51.4742768635629 0 -1.79769313486232e+308,-0.457470821752906 51.474364454451 0 -1.79769313486232e+308,-0.452403039275168 51.4743796256958 0 -1.79769313486232e+308,-0.452246046228737 51.4742687331168 0 -1.79769313486232e+308,-0.452112857787284 51.4742487841872 0 -1.79769313486232e+308,-0.451990649639015 51.4742207886306 0 -1.79769313486232e+308,-0.451845642714119 51.4741605227468 0 -1.79769313486232e+308,-0.451582534773507 51.4742741813538 0 -1.79769313486232e+308,-0.451456303311716 51.4741789629338 0 -1.79769313486232e+308,-0.450938804609791 51.4744128180323 0 -1.79769313486232e+308,-0.450789858190376 51.4743100558994 0 -1.79769313486232e+308,-0.450504957301519 51.4744324316858 0 -1.79769313486232e+308,-0.450413426918857 51.474364454451 0 -1.79769313486232e+308,-0.450372439412348 51.4743808829813 0 -1.79769313486232e+308,-0.450428346706502 51.4744274863629 0 -1.79769313486232e+308,-0.450302031425679 51.4744810467242 0 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>>> wkb = '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>>> GEOSGeometry(wkt)
<MultiPolygon object at 0x7f52fd517f78>

>>> GEOSGeometry(wkb)
GEOS_ERROR: IllegalArgumentException: Points of LinearRing do not form a closed linestring

Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/mat/virtualenvs/test/lib/python3.6/site-packages/django/contrib/gis/geos/geometry.py", line 690, in __init__
    g = wkb_r().read(force_bytes(geo_input))
  File "/home/mat/virtualenvs/test/lib/python3.6/site-packages/django/contrib/gis/geos/prototypes/io.py", line 151, in read
    return wkb_reader_read_hex(self.ptr, wkb, len(wkb))
  File "/home/mat/virtualenvs/test/lib/python3.6/site-packages/django/contrib/gis/geos/libgeos.py", line 155, in __call__
    return self.func(*args, **kwargs)
  File "/home/mat/virtualenvs/test/lib/python3.6/site-packages/django/contrib/gis/geos/prototypes/threadsafe.py", line 48, in __call__
    return self.cfunc(self.thread_context.handle.ptr, *args)
  File "/home/mat/virtualenvs/test/lib/python3.6/site-packages/django/contrib/gis/geos/prototypes/errcheck.py", line 32, in check_geom
    raise GEOSException('Error encountered checking Geometry returned from GEOS C function "%s".' % func.__name__)
django.contrib.gis.geos.error.GEOSException: Error encountered checking Geometry returned from GEOS C function "GEOSWKBReader_readHEX_r".

The error traces through to the upstream C code, but I'm not sure whether that's the root cause or whether it's in the Python wrapper.