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ripgrep
ripgrep recursively searches directories for a regex pattern while respecting your gitignore
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Git
Git Source Code Mirror - This is a publish-only repository but pull requests can be turned into patches to the mailing list via GitGitGadget (https://gitgitgadget.github.io/). Please follow Documentation/SubmittingPatches procedure for any of your improvements.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
This is not an answer for git grep, however https://github.com/BurntSushi/ripgrep is a tool exactly like git grep (but a bit faster), and it supports binary files as well with -a:
I skimmed through some history of git's grep.c and couldn't see any commits since that thread (which was July 2019) that seem related to this issue, so I don't think any fix or workaround was applied.