In file ../include/EST_error.h:

## enum EST_error_behaviour

> Defines the attitude of a call to possible fatal errors.

est_errors_checked
  Function will not normally return an error unless something really bad has gone wrong.
est_errors_allowed
  Function will throw errors when feature doesn't exist
est_errors_never
  No fatal errors allowed.

## Documentation

> Defines the attitude of a call to possible fatal errors. Passing one of these values to a function tells it how much care it needs to take to avoid calls to EST_error.

> These need snappier names. the numbers are their for historical reasons

`est_errors_checked`
  Function will not normally return an error unless something really bad has gone wrong. For feature lookup, will return default value if feature doesn't exist

`est_errors_allowed`
  Function will throw errors when feature doesn't exist

`est_errors_never`
  No fatal errors allowed. Function must catch all EST_error calls. Will *always* return a default value.

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