Trace
This API helps you track where a value originated and where it was mutated,
or any other points of interest.
In debug mode, it adds a small size penalty (104 bytes on 64-bit architectures)
to the aggregate that you add it to.
In release mode, it is size 0 and all methods are no-ops.
This is a pre-made type with default settings.
For more advanced usage, see ConfigurableTrace.