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### Possible Pitfalls and Safety Nets

You might already see some possible programming errors that could be made that would not be at caught compile-time but could cause problems at run-time. If you haven't, this might be the time to point them out. Nevertheless, if one follows the design patterns described in this document, avoiding these pitfalls should not be difficult.

- Use only `String` objects as keys.
- Use Consistant Value Types When Reading and Writing Metadata.
- Handle Updateable Metadata Values With Care.