filesize conversion (#5770)

crates/nu-protocol/src/value/from.rs

@@ -16,6 +16,8 @@ impl Value {
     pub fn as_i64(&self) -> Result<i64, ShellError> {
         match self {
             Value::Int { val, .. } => Ok(*val),
+            Value::Filesize { val, .. } => Ok(*val),
+            Value::Duration { val, .. } => Ok(*val),
             x => Err(ShellError::CantConvert(
                 "i64".into(),
                 x.get_type().to_string(),