#printString (implemented by #printOn:) creates a human-readable
description of your object. #storeString (or, more precisely,
#storeOn:) is a machine-parsable serialization of your object.
"Storing" writes out code that recreates the object when later read
back in (using #readFrom:). So a test for correctness of storing
would mean to compare the original and the read-back object.

In the case of literal objects, both representations are usually
equivalent. But try this:

which gives

Only the storeString can be correctly read back in

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