Change Details

**Actual incrementation** - Increment a non existing variable - Increment the same variable with the default term 1 - Increment the same variable with an arbitrary term - Ensure the final value is correct **Error handling** - Increment with a non integer term **Tested on Wearg** ``` 16:22:08 <Dereckson> .s Core 16:22:09 <Dereckson> .tcl registry incr quux 16:22:09 <Wearg> Tcl: 16:22:12 <Dereckson> .tcl registry incr quux 16:22:12 <Wearg> Tcl: 16:22:13 <Dereckson> .tcl registry incr quux 16:22:13 <Wearg> Tcl: 16:22:14 <Dereckson> .tcl registry incr quux 16:22:14 <Wearg> Tcl: 16:22:16 <Dereckson> .tcl registry incr quux 9 16:22:16 <Wearg> Tcl: 16:22:18 <Dereckson> .tcl registry incr quux foo 16:22:18 <Wearg> Tcl error: The increment term must be integer. 16:22:29 <Dereckson> .tcl registry get quux 16:22:29 <Wearg> Tcl: 13 ```