data.table syntax no longer supported? #400

I understand that this package is soft deprecated but I am hoping for a quick clarification in the existing capabilities.

I'm working with an FST + data.table workflow but with some tables that are too large to work with in memory at once. The disk.frame package is appealing because I've invested my code base in the data.table syntax which appears to be well supported. However, when I try to use the [ operator on a disk.frame created from a folder of .fst files, I get the error:

> myData <- disk.frame("path/myData") Error in [.disk.frame( myData, ) : [ data.table syntax is no longer supported

I haven't found any release notes or comments indicating if or when this syntax was discontinued. Is this expected?