TST: Tests for handling large integers in MMIO
TST: Tests for handling large integers in MMIO

Added test cases to ensure that integers up to `int` precision are
supported and that larger integers raise the appropriate
OverflowError.

ilayn/scipy,gfyoung/scipy,Stefan-Endres/scipy,matthew-brett/scipy,matthew-brett/scipy,pschella/scipy,pbrod/scipy,kalvdans/scipy,pizzathief/scipy,gertingold/scipy,endolith/scipy,Stefan-Endres/scipy,grlee77/scipy,jor-/scipy,jakevdp/scipy,endolith/scipy,aarchiba/scipy,aeklant/scipy,pschella/scipy,person142/scipy,vigna/scipy,befelix/scipy,Eric89GXL/scipy,WarrenWeckesser/scipy,pschella/scipy,aeklant/scipy,andyfaff/scipy,endolith/scipy,perimosocordiae/scipy,Eric89GXL/scipy,Stefan-Endres/scipy,mdhaber/scipy,pbrod/scipy,perimosocordiae/scipy,andyfaff/scipy,befelix/scipy,andyfaff/scipy,Eric89GXL/scipy,pbrod/scipy,scipy/scipy,apbard/scipy,tylerjereddy/scipy,person142/scipy,e-q/scipy,e-q/scipy,grlee77/scipy,befelix/scipy,vigna/scipy,matthew-brett/scipy,ilayn/scipy,josephcslater/scipy,arokem/scipy,perimosocordiae/scipy,nmayorov/scipy,person142/scipy,kalvdans/scipy,kalvdans/scipy,kalvdans/scipy,befelix/scipy,endolith/scipy,ilayn/scipy,tylerjereddy/scipy,rgommers/scipy,aeklant/scipy,scipy/scipy,anntzer/scipy,pschella/scipy,jamestwebber/scipy,ilayn/scipy,jor-/scipy,rgommers/scipy,nmayorov/scipy,person142/scipy,Stefan-Endres/scipy,pschella/scipy,pbrod/scipy,lhilt/scipy,vigna/scipy,zerothi/scipy,josephcslater/scipy,aeklant/scipy,apbard/scipy,aarchiba/scipy,lhilt/scipy,lhilt/scipy,gertingold/scipy,WarrenWeckesser/scipy,pizzathief/scipy,nmayorov/scipy,matthew-brett/scipy,mdhaber/scipy,andyfaff/scipy,perimosocordiae/scipy,Eric89GXL/scipy,tylerjereddy/scipy,josephcslater/scipy,mdhaber/scipy,e-q/scipy,dominicelse/scipy,endolith/scipy,zerothi/scipy,WarrenWeckesser/scipy,rgommers/scipy,anntzer/scipy,mdhaber/scipy,arokem/scipy,nmayorov/scipy,lhilt/scipy,aeklant/scipy,dominicelse/scipy,dominicelse/scipy,dominicelse/scipy,ilayn/scipy,zerothi/scipy,apbard/scipy,vigna/scipy,WarrenWeckesser/scipy,jakevdp/scipy,jjhelmus/scipy,jakevdp/scipy,pizzathief/scipy,gertingold/scipy,jjhelmus/scipy,person142/scipy,gfyoung/scipy,ilayn/scipy,jakevdp/scipy,jjhelmus/scipy,rgommers/scipy,arokem/scipy,kalvdans/scipy,pbrod/scipy,anntzer/scipy,jor-/scipy,gfyoung/scipy,grlee77/scipy,pbrod/scipy,jakevdp/scipy,e-q/scipy,aarchiba/scipy,nmayorov/scipy,apbard/scipy,jamestwebber/scipy,anntzer/scipy,arokem/scipy,gertingold/scipy,anntzer/scipy,zerothi/scipy,jor-/scipy,gertingold/scipy,arokem/scipy,tylerjereddy/scipy,scipy/scipy,Stefan-Endres/scipy,anntzer/scipy,WarrenWeckesser/scipy,grlee77/scipy,scipy/scipy,pizzathief/scipy,mdhaber/scipy,rgommers/scipy,pizzathief/scipy,dominicelse/scipy,befelix/scipy,scipy/scipy,jamestwebber/scipy,josephcslater/scipy,jor-/scipy,perimosocordiae/scipy,mdhaber/scipy,vigna/scipy,Stefan-Endres/scipy,zerothi/scipy,aarchiba/scipy,josephcslater/scipy,gfyoung/scipy,Eric89GXL/scipy,jjhelmus/scipy,perimosocordiae/scipy,zerothi/scipy,gfyoung/scipy,andyfaff/scipy,aarchiba/scipy,grlee77/scipy,tylerjereddy/scipy,apbard/scipy,jamestwebber/scipy,jjhelmus/scipy,Eric89GXL/scipy,lhilt/scipy,e-q/scipy,jamestwebber/scipy,matthew-brett/scipy,endolith/scipy,WarrenWeckesser/scipy,andyfaff/scipy,scipy/scipy