# JOURNAL — phase lex

## Approach

- `Token` is a `dataclass` with `kind: str` and `value: Union[int, float, str, None]`.
- `tokenize()` is a simple single-pass scanner using index `i`.
- Numbers: greedy scan of digits and `.`; if `.` present → `float`, else → `int`.
- Operators/parens: single-char dispatch via `_SINGLE` dict.
- Whitespace (space, tab): skipped silently.
- Anything else: raises `LexError` with the offending char and position.
- `EOF` token appended at the end.

## Test count: 13 — all green on first run.