Function trusted_floor 

pub fn trusted_floor(
    checkpoint: &Checkpoint,
    stream: &str,
    stream_created_unix_ns: i64,
    stream_last_seq: u64,
    subject: &str,
) -> Result<u64, String>

Decides whether a saved checkpoint can be used for the stream as it is now.

Arguments

• checkpoint - Saved checkpoint.
• stream - Current stream name.
• stream_created_unix_ns - Current stream creation time.
• stream_last_seq - Current last sequence of the stream.
• subject - Current channel subject.

Returns

The trusted floor, or the reason the checkpoint is ignored.