I have a script that generates a serialized file of native data
structures (hash of hashes & arrays and such).
In a short spike script I wanted to load up a particular file, and got a
incompatible marshal file format (can’t be read) (TypeError)
format version 4.8 required; 47.85 given
Both scripts invoke the same ruby instance on my system (OS X)
printing RUBY_VERSION at the top of both scripts yields 1.8.6 in both.