Swan standard module
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Modules are namespaces that can be loaded at runtime using the `require`
builtin function. The available modules are:

- [debug](./debug.md) containing function for debugging of swan code
- [dict](./dict.md) containing an implementation of a dictionary type
- [json](./json.md) containing function to parse and stringify JSON data
- [math](./math.md) containing mathematical functions and constants
- [time](./time.md) containing functions for date and time manipulation