Changes include:
- Refactor of strings into package-wide constants.
- Predeclaration of regexps to be instantiated at package load time.
- Checking of unchecked errors.
- Structural changes:
- Adding verifications to type-casting code.
- Remove unnecessary 'len(X) > 0' checks before iterating over X.
- Remove unnecessary 'else' clause after 'if' with 'return'.
- Unexporting of public fields of Bridge struct.
- Formatting:
- One-field-per-line struct definitions.
