Peter Goodspeed-Niklaus db69eb04bb Add BoundedBTreeMap to frame_support::storage (#8745)
* Add `BoundedBTreeMap` to `frame_support::storage`

Part of https://github.com/paritytech/substrate/issues/8719.

* max_encoded_len will never encode length > bound

* requiring users to maintain an unchecked invariant is unsafe

* only impl debug when std

* add some marker traits

* add tests
2021-05-06 13:54:13 +00:00
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