allow changing the current value of a spring (similar to sources)

src/spring.luau

@@ -201,9 +201,27 @@ local function spring<T>(source: () -> T, period: number?, damping_ratio: number
     -- set output to goal
     output.cache = data.source_value
 
-    return function()
+    return function(...)
-        push_child_to_scope(output)
+        if select("#", ...) == 0 then -- no args were given
-        return output.cache
+			push_child_to_scope(output)
+			return output.cache
+		end
+
+		-- set current position to value
+		local v = ... :: T
+		data.x0_123, data.x0_456 = type_to_vec6[typeof(v)](v)
+		
+		-- reset velocity
+		data.v_123 = ZERO
+		data.v_456 = ZERO
+		
+		-- schedule spring
+		springs[data] = output
+
+		-- set output to value
+		output.cache = v
+		
+		return v
     end
 end