Fix and rename lookupType

src/world.zig

@@ -101,10 +101,11 @@ pub fn World(comptime ctx: anytype) type {
             return Entity.fromRaw(self, current);
         }
 
-        /// Returns the component `Entity` registered for the specified
-        /// type `T`, or an error if an association has not been made.
-        pub fn lookupByType(self: *Self, comptime T: type) !Entity {
-            return lookupAlive(self, Context.lookup(T).*);
+        /// Returns the component `Entity` registered for the specified type
+        /// `T`, or an error if an association has not been made, or the
+        /// entity is not alive.
+        pub fn lookupType(self: *Self, comptime T: type) !Entity {
+            return lookupAlive(self, Context.lookup(T));
         }
 
         /// Creates or modifies an `Entity` in this `World`.
@@ -157,7 +158,7 @@ pub fn World(comptime ctx: anytype) type {
         /// Returns `error.ComponentMissing` if the component is missing.
         /// Both of these may occur from not calling `singleton()` first.
         pub fn get(self: *Self, comptime T: type) !T {
-            const e = try self.lookupByType(T);
+            const e = try self.lookupType(T);
             return e.get(T) orelse error.ComponentMissing;
         }
 
@@ -166,7 +167,7 @@ pub fn World(comptime ctx: anytype) type {
         /// Returns `error.IsNotAlive` if the entity is missing.
         /// This may occur from not calling `singleton()` first.
         pub fn set(self: *Self, comptime T: type, value: T) !void {
-            const e = try self.lookupByType(T);
+            const e = try self.lookupType(T);
             e.set(T, value);
         }