TST: Add more `Literal`-related tests
TST: Add more `Literal`-related tests

mattip/numpy,mhvk/numpy,grlee77/numpy,endolith/numpy,rgommers/numpy,pbrod/numpy,madphysicist/numpy,anntzer/numpy,rgommers/numpy,anntzer/numpy,grlee77/numpy,jakirkham/numpy,pbrod/numpy,simongibbons/numpy,jakirkham/numpy,mattip/numpy,anntzer/numpy,charris/numpy,endolith/numpy,pbrod/numpy,simongibbons/numpy,madphysicist/numpy,jakirkham/numpy,pdebuyl/numpy,anntzer/numpy,seberg/numpy,rgommers/numpy,mattip/numpy,seberg/numpy,mhvk/numpy,rgommers/numpy,mattip/numpy,mhvk/numpy,madphysicist/numpy,seberg/numpy,madphysicist/numpy,pdebuyl/numpy,charris/numpy,numpy/numpy,charris/numpy,mhvk/numpy,jakirkham/numpy,simongibbons/numpy,jakirkham/numpy,grlee77/numpy,numpy/numpy,seberg/numpy,charris/numpy,grlee77/numpy,numpy/numpy,simongibbons/numpy,grlee77/numpy,pbrod/numpy,simongibbons/numpy,pbrod/numpy,madphysicist/numpy,pdebuyl/numpy,pdebuyl/numpy,numpy/numpy,mhvk/numpy,endolith/numpy,endolith/numpy