Contexts UI - import Precision as string due problems with Blender UI

Btw this is where you can edit model geometry precision - https://i.imgur.com/CLln0oK.png
Related Blender issue - https://projects.blender.org/blender/blender/issues/128238

src/bonsai/bonsai/bim/helper.py

@@ -153,6 +153,7 @@ def import_attribute(
     new.data_type = data_type if isinstance(data_type, str) else ""
     new.ifc_class = data["type"]
     is_handled_by_callback = callback(attribute.name(), new, data) if callback else None
+    data_type = new.data_type  # Allow callback to override data type.
 
     if is_handled_by_callback:
         pass  # Our job is done

src/bonsai/bonsai/tool/context.py

@@ -43,6 +43,10 @@ class Context(bonsai.core.tool.Context):
                 elif name == "CoordinateSpaceDimension":
                     props.context_attributes.remove(props.context_attributes.find("CoordinateSpaceDimension"))
                     return True
+            else:  # IfcGeometricRepresentationContext
+                # Import precision as a string because Blender has problem displaying 1e-7 and smaller numbers in UI.
+                if name == "Precision":
+                    prop.data_type = "string"
 
         bonsai.bim.helper.import_attributes(context.is_a(), props.context_attributes, context.get_info(), callback)
 
@@ -56,4 +60,12 @@ class Context(bonsai.core.tool.Context):
 
     @classmethod
     def export_attributes(cls) -> dict[str, Any]:
-        return bonsai.bim.helper.export_attributes(bpy.context.scene.BIMContextProperties.context_attributes)
+        def callback(attributes, blender_attribute) -> bool:
+            if blender_attribute.name == "Precision":
+                attributes["Precision"] = float(blender_attribute.get_value())
+                return True
+            return False
+
+        return bonsai.bim.helper.export_attributes(
+            bpy.context.scene.BIMContextProperties.context_attributes, callback=callback
+        )