Merge pull request #821 from effigies/fix/boldref_dtype

FIX: Save boldrefs as float32

Author: effigies

niworkflows/interfaces/bids.py

@@ -74,7 +74,7 @@ def _none():
         ("mask", "uint8"),
         ("dseg", "int16"),
         ("probseg", "float32"),
-        ("boldref", "source"),
+        ("boldref", "float32"),
     ),
 )