fix(validators): Stop converting default when is_type_of is set to str (

#1066)

* fix(validators): Stop converting default when is_type_of is set to str

When a validator defines both `is_type_of=str, default="0.30"` the
validation process SHOULD NOT convert the default to a float, so
the current solution was to bypass toml by adding extra quotes.

NOTE: Future solution, in 4.0.0 will be to decouple defaults declaration
from validation declaration, and completely remove the tomlfy function

fix: #1064

dynaconf/validator.py

@@ -257,12 +257,10 @@ def _validate_items(
             # to default on validator (see #585)
             # The solution we added on #667 introduced a new problem
             # This fix here makes it to work for both cases.
-            if (
-                isinstance(default_value, str)
-                and default_value.startswith(("+", "-"))
-                and self.is_type_of is str
-            ):
-                # avoid TOML from parsing "+-1" as integer
+            # This guard also fixes #1064 assuming that any validator
+            # having is_type_of=str wants to bypass toml inference.
+            if isinstance(default_value, str) and self.is_type_of is str:
+                # avoid TOML from parsing "+-1" started strings as integer
                 default_value = f"'{default_value}'"
 
             value = settings.setdefault(

tests_functional/issues/1064_validator_default_type/app.py

@@ -0,0 +1,28 @@
+from __future__ import annotations
+
+from dynaconf import Dynaconf
+from dynaconf import Validator
+
+# Load config files
+config = Dynaconf(settings_files=["settings.toml"])
+
+
+validators = [
+    Validator(
+        "version",
+        is_type_of=str,
+        default="0.30",  # this must not be transformed to float
+        apply_default_on_none=True,
+    ),
+]
+
+config.validators.register(*validators)
+config.validators.validate()
+
+
+print(type(config.version))
+print(config.version)
+
+
+assert config.version == "0.30"
+assert isinstance(config.version, str)