clodius aggregate bigwig throws "RuntimeError: Unable to create attribute (Object header message is too large)" for large genomes

I am running clodius aggregate on a bigwig that was mapped to a poorly assembled genome with 23k contigs. I intend to show only <40 chromosomes and I created a negspy genome using the reduced set of chromsizes. However, aggregate still writes the full chromsizes from the bigwig header into the hitile, which overflows the limit set by HDF5 (see below the error at line aggregate.py:542). I believe this error could be fixed by writing the chromsizes from the negspy genome instead?..

me@mymachine:$ clodius aggregate bigwig -a bigGenomeReducedTo40Chroms data.fc.signal.bw

Traceback (most recent call last):
File "/home/golobor/miniconda3/bin/clodius", line 11, in
sys.exit(cli())
File "/home/golobor/miniconda3/lib/python3.6/site-packages/click/core.py", line 722, in __call__
return self.main(*args, **kwargs)
File "/home/golobor/miniconda3/lib/python3.6/site-packages/click/core.py", line 697, in main
rv = self.invoke(ctx)
File "/home/golobor/miniconda3/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/golobor/miniconda3/lib/python3.6/site-packages/click/core.py", line 1066, in invoke
return _process_result(sub_ctx.command.invoke(sub_ctx))
File "/home/golobor/miniconda3/lib/python3.6/site-packages/click/core.py", line 895, in invoke
return ctx.invoke(self.callback, **ctx.params)
File "/home/golobor/miniconda3/lib/python3.6/site-packages/click/core.py", line 535, in invoke
return callback(*args, **kwargs)
File "/home/golobor/miniconda3/lib/python3.6/site-packages/clodius/cli/aggregate.py", line 1026, in bigwig
_bigwig(filepath, chunk_size, zoom_step, tile_size, output_file, assembly, chromosome)
File "/home/golobor/miniconda3/lib/python3.6/site-packages/clodius/cli/aggregate.py", line 542, in _bigwig
d.attrs['chrom-names'] = [s.encode('utf-8') for s in bwf.chroms().keys()]
File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper (/home/ilan/minonda/conda-bld/h5py_1490028290543/work/h5py/_objects.c:2846)
File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper (/home/ilan/minonda/conda-bld/h5py_1490028290543/work/h5py/_objects.c:2804)
File "/home/golobor/miniconda3/lib/python3.6/site-packages/h5py/_hl/attrs.py", line 93, in __setitem__
self.create(name, data=value, dtype=base.guess_dtype(value))
File "/home/golobor/miniconda3/lib/python3.6/site-packages/h5py/_hl/attrs.py", line 188, in create
attr = h5a.create(self._id, self._e(tempname), htype, space)
File "h5py/_objects.pyx", line 54, in h5py._objects.with_phil.wrapper (/home/ilan/minonda/conda-bld/h5py_1490028290543/work/h5py/_objects.c:2846)
File "h5py/_objects.pyx", line 55, in h5py._objects.with_phil.wrapper (/home/ilan/minonda/conda-bld/h5py_1490028290543/work/h5py/_objects.c:2804)
File "h5py/h5a.pyx", line 47, in h5py.h5a.create (/home/ilan/minonda/conda-bld/h5py_1490028290543/work/h5py/h5a.c:2075)
RuntimeError: Unable to create attribute (Object header message is too large)