Embedding: static nodejs variables are not set to default

• Version: v8.x (maybe any)
• Platform: MS Windows 7
• Subsystem: embedding

I use nodejs to run javascript code in my application. And I have found that after running script from code, script from file will not run. It is caused by unpredicted value of eval_string static variable, that was not set to nullptr at previous run, and bootstrap tries to run code instead of file. Also I think, some other static variables can interrupt running scripts too.