ASMAPI.getSystemPropertyFlag() checks the given property without only…

… prepending "coremod." (#45)

src/main/java/net/minecraftforge/coremod/api/ASMAPI.java

@@ -60,14 +60,14 @@ private static String map(String name, INameMappingService.Domain domain) {
                 map(f -> f.apply(domain, name)).orElse(name);
     }
 
+    /**
+     * Checks if the given JVM property (or if the property prepended with {@code "coremod."}) is {@code true}.
+     *
+     * @param propertyName the property to check
+     * @return true if the property is true
+     */
     public static boolean getSystemPropertyFlag(final String propertyName) {
-        return Boolean.getBoolean("coremod." + propertyName) || getSystemPropertyFlagOld(propertyName);
-    }
-
-    /** @deprecated Contains the old, bugged logic that {@link #getSystemPropertyFlag(String)} used to have. */
-    @Deprecated(forRemoval = true, since = "5.0")
-    private static boolean getSystemPropertyFlagOld(final String propertyName) {
-        return Boolean.getBoolean(System.getProperty("coremod." + propertyName, "TRUE"));
+        return Boolean.getBoolean(propertyName) || Boolean.getBoolean("coremod." + propertyName);
     }
 
     public enum InsertMode {