Summary:
Change NumberParse.parse to return not just the parsed number but also information it gathered along the way about how the input string was formatted.
Use this in the new NumberParse.guessOptions to guess the actual widget options based on an array of strings.
Use NumberParse.guessOptions in TypeConversion (for when a user explicitly chooses to change type) and in ValueGuesser (for guesses about strings entered into empty columns).
Test Plan: Adds unit tests for NumberParse and ValueGuesser and updates the TypeChange2 nbrowser test.
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D3294
Summary:
Adds `common/ValueGuesser.ts` with logic for guessing column type and widget options (only for dates/datetimes) from an array of strings, and converting the strings to the guessed type in a lossless manner, so that converting back to Text gives the original values.
Changes `_ensure_column_accepts_data` in Python to call an exported JS method using the new logic where possible.
Test Plan: Added `test/common/ValueGuesser.ts` to unit test the core guessing logic and a DocApi end-to-end test for what happens to new columns.
Reviewers: georgegevoian
Reviewed By: georgegevoian
Differential Revision: https://phab.getgrist.com/D3290
