feat: Adds psychrometrics calculator.

Sources/Routes/URLRoutingExtensions.swift

@@ -0,0 +1,40 @@
+import URLRouting
+
+// Allow the use of a field key enum as the `name` parameter, to avoid
+// stringly type name fields.
+public extension Field {
+
+  @inlinable
+  init<Key>(
+    _ name: Key,
+    default defaultValue: Value.Output? = nil,
+    @ParserBuilder<Substring> _ value: () -> Value
+  ) where Key: RawRepresentable, Key.RawValue == String {
+    self.init(name.rawValue, default: defaultValue, value)
+  }
+
+  @inlinable
+  init<Key, C>(
+    _ name: Key,
+    _ value: C,
+    default defaultValue: Value.Output? = nil,
+  ) where Key: RawRepresentable, Key.RawValue == String,
+    Value == Parsers.MapConversion<Parsers.ReplaceError<Rest<Substring>>, C>
+  {
+    self.init(name.rawValue, value, default: defaultValue)
+  }
+
+  @inlinable
+  init<Key>(
+    _ name: Key,
+    default defaultValue: Value.Output? = nil
+  )
+    where
+    Key: RawRepresentable, Key.RawValue == String,
+    Value == Parsers.MapConversion<
+      Parsers.ReplaceError<Rest<Substring>>, Conversions.SubstringToString
+    >
+  {
+    self.init(name.rawValue, default: defaultValue)
+  }
+}