feat(space): set precedence on dispatches (#139)

Signed-off-by: nstarman <nstarman@users.noreply.github.com>

conftest.py

@@ -1,7 +1,5 @@
 """Doctest configuration."""
 
-from __future__ import annotations
-
 from doctest import ELLIPSIS, NORMALIZE_WHITESPACE
 
 from sybil import Sybil

src/coordinax/_space.py

@@ -451,6 +451,10 @@ def to_units(
         raise NotImplementedError
 
 
+# ===============================================================
+# Related dispatches
+
+
 @dispatch  # type: ignore[misc]
 def represent_as(space: Space, target: type[AbstractVector], /) -> Space:
     """Represent the current vector to the target vector."""
@@ -459,6 +463,22 @@ def represent_as(space: Space, target: type[AbstractVector], /) -> Space:
     )
 
 
+# NOTE: need to set the precedence because `Space` is both a `Mapping` and a
+#       `dataclass`, which are both in the `replace` dispatch table.
+@dispatch(precedence=1)  # type: ignore[misc]
+def replace(obj: Space, /, **kwargs: AbstractVector) -> Space:
+    """Replace the components of the vector."""
+    return type(obj)(**{**obj, **kwargs})
+
+
+# NOTE: need to set the precedence because `Space` is both a `Mapping` and a
+#       `dataclass`, which are both in the `field_items` dispatch table.
+@dispatch(precedence=1)  # type: ignore[misc]
+def field_items(obj: Space, /) -> ItemsView[str, AbstractVector]:
+    """Return the items from a Space."""
+    return obj.items()
+
+
 # =============================================================== Temporary
 # These functions are very similar to `represent_as`, but I don't think this is
 # the best API. Until we figure out a better way to do this, we'll keep these
@@ -495,15 +515,3 @@ def temp_represent_as(
         space["speed"],
         space["length"],
     )
-
-
-@dispatch  # type: ignore[misc]
-def replace(obj: Space, /, **kwargs: AbstractVector) -> Space:
-    """Replace the components of the vector."""
-    return type(obj)(**{**obj, **kwargs})
-
-
-@dispatch  # type: ignore[misc]
-def field_items(obj: Space, /) -> ItemsView[str, AbstractVector]:
-    """Return the items from a Space."""
-    return obj.items()