isnum() checks for squeak component initialisation (#39847)
isnum() checks for squeak component initialisation (#39847)

if you supply step_delay_override or use_delay_override as 0 then component
just ignores these new values despite them being valid options

by using isnum() checks, these values can actually be used for this
GuyonBroadway/HippieStation,GuyonBroadway/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation,Memendia/HippieStation,GuyonBroadway/HippieStation,McBawbaggings/HippieStation,GuyonBroadway/HippieStation,GuyonBroadway/HippieStation,McBawbaggings/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation,GuyonBroadway/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation,McBawbaggings/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation,Memendia/HippieStation,GuyonBroadway/HippieStation,GuyonBroadway/HippieStation,Memendia/HippieStation,Memendia/HippieStation,McBawbaggings/HippieStation