tests: Test for explicit start/end args to str methods for unicode.
tests: Test for explicit start/end args to str methods for unicode.

drrk/micropython,slzatz/micropython,ericsnowcurrently/micropython,kerneltask/micropython,ericsnowcurrently/micropython,martinribelotta/micropython,mhoffma/micropython,neilh10/micropython,toolmacher/micropython,MrSurly/micropython,lbattraw/micropython,ahotam/micropython,dhylands/micropython,Vogtinator/micropython,ruffy91/micropython,Timmenem/micropython,toolmacher/micropython,toolmacher/micropython,dinau/micropython,ericsnowcurrently/micropython,Peetz0r/micropython-esp32,pozetroninc/micropython,ceramos/micropython,swegener/micropython,jlillest/micropython,neilh10/micropython,tralamazza/micropython,xhat/micropython,dxxb/micropython,vitiral/micropython,jlillest/micropython,Timmenem/micropython,noahchense/micropython,blazewicz/micropython,blmorris/micropython,cnoviello/micropython,mhoffma/micropython,oopy/micropython,rubencabrera/micropython,jmarcelino/pycom-micropython,firstval/micropython,warner83/micropython,tuc-osg/micropython,alex-march/micropython,mhoffma/micropython,alex-robbins/micropython,MrSurly/micropython-esp32,adafruit/micropython,suda/micropython,dhylands/micropython,Peetz0r/micropython-esp32,danicampora/micropython,xhat/micropython,misterdanb/micropython,suda/micropython,pozetroninc/micropython,bvernoux/micropython,bvernoux/micropython,deshipu/micropython,chrisdearman/micropython,hosaka/micropython,neilh10/micropython,hosaka/micropython,jimkmc/micropython,ericsnowcurrently/micropython,HenrikSolver/micropython,alex-robbins/micropython,adamkh/micropython,utopiaprince/micropython,dxxb/micropython,Vogtinator/micropython,MrSurly/micropython-esp32,adafruit/micropython,infinnovation/micropython,Vogtinator/micropython,warner83/micropython,adamkh/micropython,drrk/micropython,methoxid/micropystat,jimkmc/micropython,warner83/micropython,firstval/micropython,orionrobots/micropython,redbear/micropython,mgyenik/micropython,pozetroninc/micropython,xhat/micropython,cnoviello/micropython,MrSurly/micropython-esp32,kostyll/micropython,vriera/micropython,xyb/micropython,adafruit/circuitpython,torwag/micropython,AriZuu/micropython,cloudformdesign/micropython,ruffy91/micropython,MrSurly/micropython,chrisdearman/micropython,tobbad/micropython,omtinez/micropython,EcmaXp/micropython,turbinenreiter/micropython,EcmaXp/micropython,MrSurly/micropython,ruffy91/micropython,oopy/micropython,blazewicz/micropython,dhylands/micropython,selste/micropython,aethaniel/micropython,oopy/micropython,kerneltask/micropython,adamkh/micropython,stonegithubs/micropython,pramasoul/micropython,feilongfl/micropython,selste/micropython,mpalomer/micropython,matthewelse/micropython,Peetz0r/micropython-esp32,swegener/micropython,blmorris/micropython,omtinez/micropython,danicampora/micropython,pozetroninc/micropython,emfcamp/micropython,rubencabrera/micropython,kostyll/micropython,warner83/micropython,chrisdearman/micropython,tobbad/micropython,methoxid/micropystat,tralamazza/micropython,aethaniel/micropython,xuxiaoxin/micropython,martinribelotta/micropython,EcmaXp/micropython,heisewangluo/micropython,cloudformdesign/micropython,SungEun-Steve-Kim/test-mp,xhat/micropython,feilongfl/micropython,dhylands/micropython,xhat/micropython,jimkmc/micropython,cwyark/micropython,noahchense/micropython,skybird6672/micropython,bvernoux/micropython,ganshun666/micropython,pfalcon/micropython,praemdonck/micropython,infinnovation/micropython,TDAbboud/micropython,tobbad/micropython,micropython/micropython-esp32,lbattraw/micropython,dhylands/micropython,lowRISC/micropython,infinnovation/micropython,henriknelson/micropython,TDAbboud/micropython,ChuckM/micropython,misterdanb/micropython,infinnovation/micropython,tobbad/micropython,ahotam/micropython,MrSurly/micropython,micropython/micropython-esp32,kostyll/micropython,ChuckM/micropython,hiway/micropython,jlillest/micropython,henriknelson/micropython,kerneltask/micropython,dmazzella/micropython,puuu/micropython,dxxb/micropython,deshipu/micropython,ganshun666/micropython,alex-march/micropython,misterdanb/micropython,blmorris/micropython,dinau/micropython,stonegithubs/micropython,paul-xxx/micropython,drrk/micropython,jlillest/micropython,aethaniel/micropython,jmarcelino/pycom-micropython,henriknelson/micropython,turbinenreiter/micropython,redbear/micropython,vriera/micropython,ganshun666/micropython,alex-march/micropython,paul-xxx/micropython,MrSurly/micropython,tobbad/micropython,xyb/micropython,selste/micropython,utopiaprince/micropython,jmarcelino/pycom-micropython,orionrobots/micropython,turbinenreiter/micropython,ruffy91/micropython,tralamazza/micropython,TDAbboud/micropython,emfcamp/micropython,praemdonck/micropython,micropython/micropython-esp32,trezor/micropython,matthewelse/micropython,vitiral/micropython,chrisdearman/micropython,aethaniel/micropython,skybird6672/micropython,slzatz/micropython,mianos/micropython,orionrobots/micropython,utopiaprince/micropython,tdautc19841202/micropython,toolmacher/micropython,orionrobots/micropython,EcmaXp/micropython,noahwilliamsson/micropython,dmazzella/micropython,alex-march/micropython,skybird6672/micropython,AriZuu/micropython,emfcamp/micropython,martinribelotta/micropython,ceramos/micropython,dxxb/micropython,pramasoul/micropython,SungEun-Steve-Kim/test-mp,misterdanb/micropython,pozetroninc/micropython,supergis/micropython,oopy/micropython,stonegithubs/micropython,tdautc19841202/micropython,blmorris/micropython,cloudformdesign/micropython,lbattraw/micropython,kostyll/micropython,mgyenik/micropython,ChuckM/micropython,ryannathans/micropython,mianos/micropython,heisewangluo/micropython,Peetz0r/micropython-esp32,selste/micropython,ganshun666/micropython,praemdonck/micropython,HenrikSolver/micropython,trezor/micropython,xyb/micropython,pramasoul/micropython,noahchense/micropython,cnoviello/micropython,AriZuu/micropython,KISSMonX/micropython,mhoffma/micropython,adafruit/micropython,pfalcon/micropython,bvernoux/micropython,praemdonck/micropython,jmarcelino/pycom-micropython,neilh10/micropython,cwyark/micropython,blazewicz/micropython,noahwilliamsson/micropython,jimkmc/micropython,puuu/micropython,methoxid/micropystat,jlillest/micropython,noahwilliamsson/micropython,xuxiaoxin/micropython,mgyenik/micropython,suda/micropython,torwag/micropython,SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32,drrk/micropython,tuc-osg/micropython,deshipu/micropython,adamkh/micropython,dmazzella/micropython,kerneltask/micropython,mpalomer/micropython,jmarcelino/pycom-micropython,firstval/micropython,PappaPeppar/micropython,KISSMonX/micropython,omtinez/micropython,MrSurly/micropython-esp32,lowRISC/micropython,EcmaXp/micropython,TDAbboud/micropython,skybird6672/micropython,dinau/micropython,rubencabrera/micropython,martinribelotta/micropython,matthewelse/micropython,Peetz0r/micropython-esp32,vitiral/micropython,henriknelson/micropython,supergis/micropython,methoxid/micropystat,ahotam/micropython,HenrikSolver/micropython,misterdanb/micropython,AriZuu/micropython,ChuckM/micropython,dinau/micropython,utopiaprince/micropython,supergis/micropython,dxxb/micropython,stonegithubs/micropython,slzatz/micropython,supergis/micropython,SHA2017-badge/micropython-esp32,danicampora/micropython,redbear/micropython,adafruit/circuitpython,rubencabrera/micropython,tuc-osg/micropython,galenhz/micropython,infinnovation/micropython,adafruit/circuitpython,xyb/micropython,mianos/micropython,xyb/micropython,orionrobots/micropython,Timmenem/micropython,jimkmc/micropython,Vogtinator/micropython,xuxiaoxin/micropython,PappaPeppar/micropython,xuxiaoxin/micropython,Vogtinator/micropython,blazewicz/micropython,alex-robbins/micropython,HenrikSolver/micropython,ahotam/micropython,henriknelson/micropython,firstval/micropython,supergis/micropython,praemdonck/micropython,paul-xxx/micropython,mpalomer/micropython,vitiral/micropython,HenrikSolver/micropython,emfcamp/micropython,deshipu/micropython,vriera/micropython,tdautc19841202/micropython,tdautc19841202/micropython,mianos/micropython,suda/micropython,PappaPeppar/micropython,ryannathans/micropython,methoxid/micropystat,matthewelse/micropython,MrSurly/micropython-esp32,hiway/micropython,galenhz/micropython,utopiaprince/micropython,puuu/micropython,micropython/micropython-esp32,trezor/micropython,ernesto-g/micropython,ryannathans/micropython,pramasoul/micropython,vitiral/micropython,torwag/micropython,feilongfl/micropython,redbear/micropython,micropython/micropython-esp32,cnoviello/micropython,galenhz/micropython,vriera/micropython,lowRISC/micropython,KISSMonX/micropython,SHA2017-badge/micropython-esp32,KISSMonX/micropython,dinau/micropython,Timmenem/micropython,pfalcon/micropython,hiway/micropython,noahchense/micropython,blazewicz/micropython,galenhz/micropython,mhoffma/micropython,paul-xxx/micropython,bvernoux/micropython,xuxiaoxin/micropython,danicampora/micropython,heisewangluo/micropython,alex-robbins/micropython,ahotam/micropython,noahwilliamsson/micropython,danicampora/micropython,tdautc19841202/micropython,redbear/micropython,ernesto-g/micropython,kostyll/micropython,tralamazza/micropython,selste/micropython,heisewangluo/micropython,matthewelse/micropython,TDAbboud/micropython,stonegithubs/micropython,adafruit/micropython,hiway/micropython,torwag/micropython,martinribelotta/micropython,dmazzella/micropython,Timmenem/micropython,suda/micropython,drrk/micropython,alex-march/micropython,oopy/micropython,ryannathans/micropython,mpalomer/micropython,hosaka/micropython,ericsnowcurrently/micropython,slzatz/micropython,tuc-osg/micropython,lowRISC/micropython,chrisdearman/micropython,noahchense/micropython,omtinez/micropython,mpalomer/micropython,toolmacher/micropython,trezor/micropython,ruffy91/micropython,emfcamp/micropython,lbattraw/micropython,turbinenreiter/micropython,trezor/micropython,deshipu/micropython,SHA2017-badge/micropython-esp32,ceramos/micropython,SungEun-Steve-Kim/test-mp,ChuckM/micropython,ernesto-g/micropython,pfalcon/micropython,matthewelse/micropython,cnoviello/micropython,skybird6672/micropython,feilongfl/micropython,cwyark/micropython,cwyark/micropython,adafruit/circuitpython,mgyenik/micropython,mianos/micropython,cloudformdesign/micropython,paul-xxx/micropython,alex-robbins/micropython,hiway/micropython,rubencabrera/micropython,adamkh/micropython,ceramos/micropython,noahwilliamsson/micropython,mgyenik/micropython,slzatz/micropython,neilh10/micropython,KISSMonX/micropython,tuc-osg/micropython,warner83/micropython,SungEun-Steve-Kim/test-mp,adafruit/circuitpython,lbattraw/micropython,puuu/micropython,ernesto-g/micropython,ceramos/micropython,vriera/micropython,pramasoul/micropython,PappaPeppar/micropython,pfalcon/micropython,SungEun-Steve-Kim/test-mp,galenhz/micropython,cloudformdesign/micropython,ernesto-g/micropython,omtinez/micropython,blmorris/micropython,swegener/micropython,ryannathans/micropython,hosaka/micropython,puuu/micropython,torwag/micropython,heisewangluo/micropython,kerneltask/micropython,swegener/micropython,cwyark/micropython,adafruit/circuitpython,aethaniel/micropython,feilongfl/micropython,AriZuu/micropython,swegener/micropython,hosaka/micropython,lowRISC/micropython,adafruit/micropython,firstval/micropython,PappaPeppar/micropython,turbinenreiter/micropython,ganshun666/micropython