Use REAL not FLOAT as SQLite column type

[simonw]

Refs:

• Change default floating point column type from FLOAT to REAL #645

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📚 Documentation preview 📚: https://sqlite-utils--680.org.readthedocs.build/en/680/

Claude Code: https://gistpreview.github.io/?ad4af0a841742a1fec5951fa1f878623

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.27%. Comparing base (fb93452) to head (e7ecb0f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #680   +/-   ##
=======================================
  Coverage   95.27%   95.27%           
=======================================
  Files           8        8           
  Lines        3008     3008           
=======================================
  Hits         2866     2866           
  Misses        142      142           

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