Bug #21680: Integer#digits bug starting from Ruby 3.1

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: ruby 3.3.10 (2025-10-23 revision 343ea05002) [amd64-freebsd14]
• Backport: 3.2: REQUIRED, 3.3: DONE, 3.4: DONE

[sigsys (Math Ieu)]

(2**512).digits(256).last

The result was 1 on Ruby 3.0. Starting from Ruby 3.1 it turned to 256 (which can't possibly be right).

[tompng (tomoya ishida)]

Pull request https://github.com/ruby/ruby/pull/15144

[tompng (tomoya ishida)]

• Status changed from Open to Closed

Applied in changeset git|f4f728b319086eea3db6e9909fb9c849c276f813.

---

[Bug #21680] Fix (base**power_of_two).digits(base) bug (#15144)

Fix wrong condition in base multiplying loop.

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN to 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 3.2: REQUIRED, 3.3: REQUIRED, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED

ruby_3_3 bc21e4d40daeb962699340162547e0fb2b50107f merged revision(s) f4f728b319086eea3db6e9909fb9c849c276f813.

[k0kubun (Takashi Kokubun)]

• Backport changed from 3.2: REQUIRED, 3.3: DONE, 3.4: REQUIRED to 3.2: REQUIRED, 3.3: DONE, 3.4: DONE

ruby_3_4 fe8221af30768cbd15409d4cc52b2bb18e91667e merged revision(s) f4f728b319086eea3db6e9909fb9c849c276f813.