Reproduction link or steps

https://repl.rolldown.rs/#eNptUstO7DAM/RUrG+Cq6uheLiyKWLFiwR9kQdo600DqVIk7PKr+O046wCAh9RHH9vGxjxdlVbMoRz2+1pzymVTzbVeqy+Y4hcjwB0yC1kSwMYygVb0To35KWt1o0tQFSsFj7cP+PDvkrXJ4PlxIhIChajjOuFYqBu/78EK1ZFm3P6n9i+cHiwV6tI7wrrhh3dicfaadZSr4WkIl0My+/L8SzhdNAI6mmRvYIOsR2dTlqoLdDnhAsM5jgoQeO8Ye2rdy287MgUAeNN0AbNoMNnnDNsSxkZm0MbwkjFpV2SM8MLoRiY1voFQG6IaZnu9L5QczNZAnUqLX8g0Tu9G9G3aBvnIc+a2DJKxnUSc31Gey3WBoj8LOJeAAj8v6CIZ6CK3QOCD0zlqMwgBaHMzBhTme1Jq5zOFYJTdhxNQKRdQSATA6cvbtlKam9ULkFBUn0z2bPcoOBJFu0+/H3aZcgdeqxwmFOnUuw0vVjLQBbYv0CXG0tuSjlnm7pAfZvluB+vvv8v/l1bVsnlol/SBxIgImVusHTE70nQ==

1. open the link
2. go to rolldown.config.ts
3. change optimization.inlineConst to {}
4. notice different behaviour

What is expected?

I would expect that {} has the same behaviour as undefined

What is actually happening?

if optimization.inlineConst != null and optimization.inlineConst.mode == null then it is defaulted to "all" instead of "smart" like documented(https://rolldown.rs/reference/InputOptions.optimization#default) .

System Info

https://repl.rolldown.rs/

Any additional comments?

If this is intended behaviour, then the docs should be updated as this behaviour is confusing. eg: a user changing the number of passes unknowingly changes the mode.