cut the byte length in half rather than substr
cut the byte length in half rather than substr

This preserves some of the extra randomness

Former-commit-id: 7d4c48e305902d872c7f6a60d05285dbf94d71a7
Former-commit-id: 0c6c6eb105ed28a724a4d2baa969c8d00db2f036
jaromirdalecky/concrete5,KorvinSzanto/concrete5,deek87/concrete5,deek87/concrete5,haeflimi/concrete5,hissy/concrete5,mainio/concrete5,concrete5/concrete5,olsgreen/concrete5,mlocati/concrete5,biplobice/concrete5,mlocati/concrete5,MrKarlDilkington/concrete5,olsgreen/concrete5,haeflimi/concrete5,rikzuiderlicht/concrete5,hissy/concrete5,acliss19xx/concrete5,haeflimi/concrete5,biplobice/concrete5,deek87/concrete5,biplobice/concrete5,triplei/concrete5-8,acliss19xx/concrete5,mainio/concrete5,acliss19xx/concrete5,haeflimi/concrete5,olsgreen/concrete5,rikzuiderlicht/concrete5,concrete5/concrete5,a3020/concrete5,concrete5/concrete5,KorvinSzanto/concrete5,biplobice/concrete5,jaromirdalecky/concrete5,mainio/concrete5,mlocati/concrete5,MrKarlDilkington/concrete5,KorvinSzanto/concrete5,triplei/concrete5-8,concrete5/concrete5,rikzuiderlicht/concrete5,mlocati/concrete5,jaromirdalecky/concrete5,a3020/concrete5,hissy/concrete5,hissy/concrete5,jaromirdalecky/concrete5,deek87/concrete5,MrKarlDilkington/concrete5,triplei/concrete5-8