Make code a bit clearer by removing optional argument.
Make code a bit clearer by removing optional argument.

maximedenes/coq,ejgallego/coq,ejgallego/coq,maximedenes/coq,ppedrot/coq,amintimany/coq,SkySkimmer/coq,Zimmi48/coq,coq/coq,Matafou/coq,coq/coq,gares/coq,maximedenes/coq,Ptival/coq,ppedrot/coq,gares/coq,gares/coq,william-lawvere/coq,SkySkimmer/coq,Lionel-Rieg/coq,maximedenes/coq,JasonGross/coq,silene/coq,Zimmi48/coq,letouzey/coq-wip,letouzey/coq-wip,coq/coq,letouzey/coq-wip,letouzey/coq-wip,ejgallego/coq,amintimany/coq,Matafou/coq,SkySkimmer/coq,ppedrot/coq,gares/coq,JasonGross/coq,gares/coq,coq/coq,Lionel-Rieg/coq,Matafou/coq,amintimany/coq,ppedrot/coq,Lionel-Rieg/coq,JasonGross/coq,silene/coq,letouzey/coq-wip,JasonGross/coq,Ptival/coq,Ptival/coq,ejgallego/coq,maximedenes/coq,Zimmi48/coq,silene/coq,SkySkimmer/coq,william-lawvere/coq,william-lawvere/coq,ppedrot/coq,Zimmi48/coq