Implement simple form of associative arrays #465
Merged
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Problem: No map-like data structures yet exist in ion.
Solution: Allow simple associative arrays with string keys
Changes introduced by this pull request:
(This was needed to support a select type based on string keys)
Drawbacks: Select objects no longer implement Copy
TODOs: Does not yet have an initializer syntax for associative arrays
Fixes: Addresses #246
State: Needs review