[LucasLeao18]

isDivisibleBy('1', 1e21) currently returns true: parseInt converts the numeric divisor to "1e+21" and truncates it to 1. Convert the divisor with Number and require an integer before applying the remainder operation. Large integer divisors then retain their value, while fractional, zero and non-finite divisors return false.

This follows the preference for integer divisors discussed in #1349 and #1350; it does not introduce approximate decimal divisibility. The README now states the divisor contract.

Validation on Node 24.15.0 / Windows:

• The exponent-notation regression fails on the base implementation.
• npm test: 325 passed, including build and lint; 100% line coverage.
• Tests cover exponent notation, zero, fractional, negative fractional and non-finite divisors across the Node and browser forms exercised by the existing harness.

Checklist

• PR contains only related changes.
• README updated.
• Regression tests included.
• Related prior discussion linked above.

Prepared with OpenAI Codex; tests were run locally.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9ff3424) to head (2cb29c6).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2939   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          114       114           
  Lines         2599      2600    +1     
  Branches       658       659    +1     
=========================================
+ Hits          2599      2600    +1     

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