I'm trying to persist a string to disk, but every mechanism I've tried 
loses bits. The string is holding binary data generated by a third-party 
lib.

Searching online has turned up lots of recommendations to use the Buffer 
class, however I'm also unable to round-trip the data through Buffer 
without losing bits. That is, in general

str !== (new Buffer(str, 'binary')).toString('binary'))

How can I persist a string without losing bits?

Are there docs anywhere on how the String class encodings work, and how to 
move data in and out of String without losing bits?

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