Brr.FileSourceFile objects and reads.
There are various ways to get File.t values. On of them is to create an El.input element of type file and use the El.Input.files function. Another way is to use drag and drop events and get them via the Ev.Data_transfer values.
The type for file initialisation objects.
init () is a file initialisation object with the given properties.
of_blob name b is a file named name with data b.
Note. Reading the constructor specificaton it seems this will not look into b to define the Blob.type' of the resulting file object's blob. You should define it via the init object.
relative_path is the webkitRelativePath of f.
last_modified_ms f is the last modified time in milliseconds since the POSIX epoch.