improve explanation of whole transient vs detached stuff

include mention of workarounds

Author: gavinking

documentation/src/main/asciidoc/introduction/Interacting.adoc

@@ -111,13 +111,19 @@ The two most useful heuristics are:
 1. If the entity has a <<generated-identifiers,generated identifier>>, the value of the id field is inspected: if the value currently assigned to the id field is the default value for the type of the field, then the object is transient; otherwise, the object is detached.
 2. If the entity has a <<version-attributes,version>>, the value of the version field is inspected: if the value currently assigned to the version field is the default value, or a negative number, then the object is transient; otherwise, the object is detached.
 
-If the entity has neither a generated id, nor a version, Hibernate falls back to just doing something reasonable.
+If the entity has neither a generated id, nor a version, Hibernate usually falls back to just doing something reasonable.
+In extreme cases a `SELECT` query will be issued to determine whether a matching row exists in the database.
 
 [WARNING]
 These heuristics aren't perfect.
-It's quite easy to confuse Hibernate by assigning a value to the id field or version field that makes a new transient instance look like it's detached.
+It's quite easy to confuse Hibernate by assigning a value to the id field or version field, makeing a new transient instance look like it's detached.
 We therefore strongly discourage assigning values to fields annotated `@GeneratedValue` or `@Version` before passing an entity to Hibernate.
 
+[TIP]
+If the heuristics ever happen cause a real problem, you may implement your own Post-it tagging via link:{doc-javadoc-url}org/hibernate/Interceptor.html#isTransient(java.lang.Object)[`Interceptor.isTransient()`].
+The `Interceptor` interface -- along with its friend link:{doc-javadoc-url}org/hibernate/CustomEntityDirtinessStrategy.html[`CustomEntityDirtinessStrategy`] -- allows advanced users to augment the built-in handling of managed entities with custom behavior.
+These interfaces are very useful if you're building your own persistence framework with Hibernate as the foundation.
+
 [[creating-session]]
 === Creating a session