chore(elixir): Negative steps are not supported in String.slice/2,

[big-r81]

Description

When running the Elixir test UUIDsTest, there is the following warnings are issued:

UUIDsTest [test/elixir/test/uuids_test.exs]
  * test no duplicates in 1,000 UUIDs (198.1ms) [L#29]
  * test sequential uuids are sequential (59.6ms) [L#50]
  * test utc_random uuids are roughly random (44.5ms) [L#64]
  * test Bad Request error when exceeding max UUID count (10.3ms) [L#42]
  * test cache busting headers are set (9.5ms) [L#9]
  * test utc_id uuids are correct [L#85]warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

warning: negative steps are not supported in String.slice/2, pass 14..-1//1 instead
  (elixir 1.17.3) lib/string.ex:2404: String.slice/2
  test/elixir/test/uuids_test.exs:91: anonymous fn/2 in UUIDsTest."test utc_id uuids are correct"/1
  (elixir 1.17.3) lib/enum.ex:2531: Enum."-reduce/2-lists^foldl/2-1-"/3
  test/elixir/test/uuids_test.exs:89: UUIDsTest."test utc_id uuids are correct"/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:485: ExUnit.Runner.exec_test/2
  (stdlib 4.3.1.5) timer.erl:235: :timer.tc/1
  (ex_unit 1.17.3) lib/ex_unit/runner.ex:407: anonymous fn/6 in ExUnit.Runner.spawn_test_monitor/4

  * test utc_id uuids are correct (43.0ms) [L#85]
  * test can return single uuid (27.5ms) [L#17]
  * test Method Not Allowed error on POST (9.5ms) [L#37]

Steps to Reproduce

make elixir tests=test/elixir/test/uuids_test.exs

Expected Behaviour

Should run without warnings.

Your Environment

• CouchDB version: main
• Elixir version used: 1.17.3