diff --git a/tools/lint/src/rules/quality/reduce-accumulator-copy.ts b/tools/lint/src/rules/quality/reduce-accumulator-copy.ts
index dcc3eb4ec..5cf907b81 100644
--- a/tools/lint/src/rules/quality/reduce-accumulator-copy.ts
+++ b/tools/lint/src/rules/quality/reduce-accumulator-copy.ts
@@ -83,8 +83,8 @@ function isBoundedSlice(node: ESTree.CallExpression): boolean {
   const start = numericLiteral(node.arguments[0])
   const end = numericLiteral(node.arguments[1])
   return (
-    (start !== null && Number.isFinite(start) && start < 0) ||
-    (end !== null && Number.isFinite(end) && end >= 0)
+    (start !== null && Number.isFinite(start) && Math.trunc(start) < 0) ||
+    (end !== null && Number.isFinite(end) && Math.trunc(end) >= 0)
   )
 }
 
diff --git a/tools/lint/tests/reduce-accumulator-copy.test.ts b/tools/lint/tests/reduce-accumulator-copy.test.ts
index ed8c37de9..4f0e43ab6 100644
--- a/tools/lint/tests/reduce-accumulator-copy.test.ts
+++ b/tools/lint/tests/reduce-accumulator-copy.test.ts
@@ -10,6 +10,8 @@ describe('no-reduce-accumulator-copy', () => {
     'items.reduce((acc, item) => acc.concat([item]), [])',
     'items.reduce((acc, item) => acc.slice(0, -1), [])',
     'items.reduce((acc, item) => acc.slice(2), [])',
+    'items.reduce((acc, item) => acc.slice(-0.5), [])',
+    'items.reduce((acc, item) => acc.slice(-0), [])',
     'items.reduce((acc, item) => { const next = acc.slice(); next.push(item); return next }, [])',
     'items.reduce((acc, item) => Object.assign({}, acc, { [item.id]: item }), {})',
     'items.reduce((acc, item) => Array.from(acc), [])'
@@ -24,6 +26,8 @@ describe('no-reduce-accumulator-copy', () => {
     'items.reduce(namedReducer, [])',
     'items.reduce((acc, item) => acc.slice(0, 1), [0])',
     'items.reduce((acc, item) => acc.slice(-2), [0])',
+    'items.reduce((acc, item) => acc.slice(-1.5), [0])',
+    'items.reduce((acc, item) => acc.slice(0, -0.5), [0])',
     'items.reduce((acc, item) => acc.slice(0, 0), [0])'
   ])('accepts owned mutation and unrelated copies: %s', async (source) => {
     expect(ruleDiagnostics(await lint(source, rules), rule)).toHaveLength(0)