don't convert small floats to scientific notation

Author: mr-c

cwltool/builder.py

@@ -28,6 +28,8 @@
 from schema_salad.validate import validate
 
 from ruamel.yaml.comments import CommentedMap
+from ruamel.yaml.representer import RoundTripRepresenter
+from ruamel.yaml.scalarfloat import ScalarFloat
 
 from .errors import WorkflowException
 from .loghandler import _logger
@@ -604,6 +606,9 @@ def tostr(self, value: Union[MutableMapping[str, str], Any]) -> str:
                     '{} object missing "path": {}'.format(value["class"], value)
                 )
             return value["path"]
+        elif isinstance(value, ScalarFloat):
+            rep = RoundTripRepresenter()
+            return str(rep.represent_scalar_float(value).value)
         else:
             return str(value)
 

tests/test_examples.py

@@ -1829,3 +1829,14 @@ def test_res_req_expr_float_1_2() -> None:
     assert exit_code == 0, stderr
     assert json.loads(stdout)["result"]["outdirSize"] >= 708
     assert json.loads(stdout)["result"]["tmpdirSize"] >= 708
+
+
+def test_very_small_floats() -> None:
+    """Confirm that very small numbers are not transformed into scientific notation."""
+    exit_code, stdout, stderr = get_main_output(
+        [
+            get_data("tests/wf/very-small-float.cwl"),
+        ]
+    )
+    assert exit_code == 0, stderr
+    assert json.loads(stdout)["result"] == "0.00001"

tests/wf/very-small-float.cwl

@@ -0,0 +1,23 @@
+cwlVersion: v1.0
+class: CommandLineTool
+baseCommand: echo
+requirements:
+  InlineJavascriptRequirement: {}
+
+inputs:
+ annotation_prokka_evalue:
+   type: float?
+   default: 0.00001
+   inputBinding: {}
+
+arguments: [ -n ]
+
+stdout: dump
+
+outputs:
+  result:
+    type: string
+    outputBinding:
+      glob: dump
+      loadContents: true
+      outputEval: $(self[0].contents)