Optionallength?: UnsignedInt | null(default: all remaining octets) Return at most this many octets of the blob data. If null or unspecified, then all remaining octets in the blob are returned. This can be considered equivalent to an infinitely large length value, except that the isTruncated warning is not given unless the start offset is past the end of the blob.
Optionaloffset?: UnsignedInt | null(default: 0) Start this many octets into the blob data
The arguments for fetching Blob objects via a
Blob/getcall