Stream API?

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First and foremost, thank you to all contributors!

As a user of this crate, I have a couple of queries:

1. In the Streamlined APIs section of the documentation, the following description can be found:

   These are useful when you only need to encrypt to a single recipient, and the data is small enough to fit in memory.

However, based on the source code, it appears the internal handling within age::Encrypt and age::decrypt also utilises a streaming approach?

2. The documentation includes this note:

   Caution: all crate versions prior to 1.0 are beta releases for testing purposes only.

Given that rage appears to be a production-ready tool, does this imply that usage is considered safe if concerns about potential API changes within this crate are not an issue?