Using increment:
Initial value:string(0) ""
Result value:string(1) "1"
Initial value:string(1) " "
Result value:string(1) " "
Initial value:string(1) "0"
Result value:int(1)
Initial value:string(4) "15.5"
Result value:float(16.5)
Initial value:string(4) "1e10"
Result value:float(10000000001)
Initial value:string(4) "199A"
Result value:string(4) "199B"
Initial value:string(4) "A199"
Result value:string(4) "A200"
Initial value:string(4) "199Z"
Result value:string(4) "200A"
Initial value:string(4) "Z199"
Result value:string(4) "Z200"
Initial value:string(11) "Hello world"
Result value:string(11) "Hello worle"
Initial value:string(4) "🐘"
Result value:string(4) "🐘"
Using decrement:
Initial value:string(0) ""
Result value:int(-1)
Initial value:string(1) " "
Result value:string(1) " "
Initial value:string(1) "0"
Result value:int(-1)
Initial value:string(4) "15.5"
Result value:float(14.5)
Initial value:string(4) "1e10"
Result value:float(9999999999)
Initial value:string(4) "199A"
Result value:string(4) "199A"
Initial value:string(4) "A199"
Result value:string(4) "A199"
Initial value:string(4) "199Z"
Result value:string(4) "199Z"
Initial value:string(4) "Z199"
Result value:string(4) "Z199"
Initial value:string(11) "Hello world"
Result value:string(11) "Hello world"
Initial value:string(4) "🐘"
Result value:string(4) "🐘"