# Techniques in debugging with preview of possibly large expressions + garbage collection issues

First of all, all appreciate all suggestions how to rephrase the title to make it more friendly.

### Here's the background:

Let's say your top level procedure flow is complicated, involves url calls, calculations etc. You can't check/assert/dialog everything because there is no time for that on prototyping stage. Additionally some things you want to preview later do not need to be wrong, you just want to confirm that call's headers are fine etc.