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Creating an Invalid Tcl_Obj via SQLite explores the interactions of SQLite and Tcl.
According to SQLite documentation, a blob that is `cast to text is "interpreted" as text encoded in the database encoding. What that means is that SQLite assumes that the blob value is properly-encoded, and assigns the type text to it. Because it doesn't verify that the value is properly encoded, it is possible store into the database a value of type "text" invalid, I.e. that is not properly encoded. Later on, SQLite may create an invalid Tcl_Obj by storing the invalid text into "bytes" field of a Tcl_Obj. The "bytes" field is supposed to store a string encoded in modified utf-8. If the data in "bytes" is not modified utf-8, various Tcl routines fail in a variety of ways. The following example illustrates some of that behaviour. First, some setup:
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