Aaron Ballman 6defc8ee66 Initialize member variable; NFC
This was found via a Coverity static analysis pass. There's no
indication this was being used incorrectly in practice, but there are
public interfaces which require `BR` to be non-null and valid, and `BR`
was not being initialized by the constructor.

This adds an in-class initializer for `BR` and some asserts, to be safe.
2025-04-10 08:28:52 -04:00
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