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As far as I can see, since the timezone database is vendored into the released crate anyway, if you don't set CHRONO_TZ_TIMEZONE_FILTER, every user will spend time and energy compiling the following set of packages to get exactly the same result as everyone else:
[build-dependencies]
└── chrono-tz-build v0.4.0
├── parse-zoneinfo v0.3.1
│ └── regex v1.11.1
│ ├── aho-corasick v1.1.3
│ │ └── memchr v2.7.4
│ ├── memchr v2.7.4
│ ├── regex-automata v0.4.9
│ │ ├── aho-corasick v1.1.3 (*)
│ │ ├── memchr v2.7.4
│ │ └── regex-syntax v0.8.5
│ └── regex-syntax v0.8.5
└── phf_codegen v0.11.2
├── phf_generator v0.11.2
│ ├── phf_shared v0.11.2
│ │ └── siphasher v0.3.11
│ └── rand v0.8.5
│ └── rand_core v0.6.4
│ └── getrandom v0.2.15
│ ├── cfg-if v1.0.0
│ └── libc v0.2.169
└── phf_shared v0.11.2 (*)
This seems like a lot of wasted time and energy.
I suggest making CHRONO_TZ_TIMEZONE_FILTER locked behind an optional feature, and just use a pre-baked chrono-tz version by default so that none of the build-dependencies need to be built.
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