Contains several self-contained utility functions reusable across projects: `camel2title` converts camelCase to Title Case with acronym support; `_interval_to_timedelta` converts interval strings (e.g., '1mo', '1wk') to timedelta/relativedelta; `safe_merge_dfs` merges event DataFrames into price data with out-of-range handling; `IndentationContext` and `log_indent_decorator` provide indented debug logging; `dynamic_docstring` and `generate_list_table_from_dict` auto-generate Sphinx documentation from dicts. These functions have minimal internal dependencies and can be extracted into new projects with little modification.

The `HistoryMetadata` class implements a lazy dictionary pattern over Yahoo Finance metadata. It defers loading of `tradingPeriods` until first access, caching the result. This pattern is reusable for any API response where some fields are expensive to fetch. The class is self-contained and can be extracted as a generic lazy dict wrapper.

Provides a `frozendict` fallback implementation (hashable, read-only dict) for use as `lru_cache` keys. This is a common need in Python caching and is implemented cleanly without external dependencies. It can be reused in any project requiring immutable dicts for caching or hashing.