[antonsoo]

PersistenceImager(birth_range=(0, 4.3), pers_range=(0, 4.3), pixel_size=0.1) currently creates a 42-by-42 grid with spacing about 0.1023. Constructor truncation and conversion of rounded widths back to integer counts lose pixels; parameter setters can produce similar errors or expand an unchanged grid.

Compute integer counts first, derive the covered widths from them, and apply the existing centered padding to constructor ranges too. Preserve the other axis when updating one range, and keep the mesh unchanged when reassigning an unchanged parameter. Handle quotient roundoff without adding a pixel to exact multiples, including both 3 * 0.1 and literal 0.9 / 0.3.

Validation: 13 of 31 new constructor/setter/rounding cases fail before; all 31 pass after. The complete suite on current master passes 155 tests, with the existing 19 warnings. Ruff format/lint, wheel/sdist builds and metadata checks pass.

On 360 persistence-image outputs from recorded handwritten-digit diagrams, this corrects 120 shapes and all 84 spacing errors. Every corrected image agrees with an independent Gaussian rectangle-CDF reference (maximum absolute pixel error 1.8e-16). Of the 240 previously correct shapes, 228 outputs stay byte-identical; the other 12 change only last-bit pixel values.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.47%. Comparing base (00144a8) to head (bd476de).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #113      +/-   ##
==========================================
+ Coverage   79.28%   79.47%   +0.19%     
==========================================
  Files          20       20              
  Lines        1477     1491      +14     
  Branches      271      275       +4     
==========================================
+ Hits         1171     1185      +14     
  Misses        229      229              
  Partials       77       77              

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