Add the 'fields' primitive. #142
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This returns a class's fields. However, SOM's semantics on this are currently unclear (see SOM-st/SOM#40). Although we allow users to mutate the 'methods' array, this is less sensible with fields in my opinion, since it would turn SOM from a statically into a dynamically scoped language. Thus, each time you call 'fields' you get a fresh array back such that any mutations made are ignored (see the `mutate_fields` test).
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This returns a class's fields. However, SOM's semantics on this are currently unclear (see SOM-st/SOM#40). Although we allow users to mutate the 'methods' array, this is less sensible with fields in my opinion, since it would turn SOM from a statically into a dynamically scoped language. Thus, each time you call 'fields' you get a fresh array back such that any mutations made are ignored (see the
mutate_fieldstest).