[Fix rubocop#13051] Fix an error for Lint/FloatComparison

Fixes rubocop#13051.

This PR fixes an error for `Lint/FloatComparison`
when comparing with rational literal.

NOTE: Using rubocop/rubocop-ast#304 in the future will allow
for a more fundamental resolution of the issue.

changelog/fix_an_error_for_lint_float_comparison.md

@@ -0,0 +1 @@
+* [#13051](https://github.com/rubocop/rubocop/issues/13051): Fix an error for `Lint/FloatComparison` when comparing with rational literal. ([@koic][])

lib/rubocop/cop/lint/float_comparison.rb

@@ -66,7 +66,9 @@ def float?(node)
         end
 
         def literal_zero?(node)
-          node&.numeric_type? && node.value.zero?
+          # FIXME: https://github.com/rubocop/rubocop-ast/pull/304 is released,
+          # replace this condition with `node&.numeric_type? && node.value.zero?`.
+          node&.numeric_type? && node.node_parts[0].zero?
         end
 
         # rubocop:disable Metrics/PerceivedComplexity

spec/rubocop/cop/lint/float_comparison_spec.rb

@@ -68,6 +68,12 @@
     RUBY
   end
 
+  it 'does not register an offense when comparing with rational literal' do
+    expect_no_offenses(<<~RUBY)
+      value == 0.2r
+    RUBY
+  end
+
   it 'does not register an offense when comparing against zero' do
     expect_no_offenses(<<~RUBY)
       x == 0.0