Make sure we don't manipulate the original object.
Make sure we don't manipulate the original object.

stencila/substance,substance/substance,andene/substance,substance/substance,TypesetIO/substance,podviaznikov/substance,podviaznikov/substance,TypesetIO/substance,michael/substance-1,andene/substance,jacwright/substance,abhaga/substance,abhaga/substance,jacwright/substance,michael/substance-1