fix(token): Be consistent on `take_until("")`

[epage]

We aren't consistent on empty buffers between simd and not.

Fixes #489

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 41.66667% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 41.82%. Comparing base (c3e3e4d) to head (9d50921).

Files	Patch %	Lines
src/stream/mod.rs	41.66%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #490 +/- ## ========================================== - Coverage 41.83% 41.82% -0.01% ========================================== Files 18 18 Lines 3043 3046 +3 ========================================== + Hits 1273 1274 +1 - Misses 1770 1772 +2 ```

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[coveralls]

Pull Request Test Coverage Report for Build 8083211839

Details

• -7 of 12 (41.67%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.009%) to 41.825%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
src/stream/mod.rs	5	12	41.67%
<!--	Total:	5	12	41.67%	-->

Totals
Change from base Build 8073857515:	-0.009%
Covered Lines:	1274
Relevant Lines:	3046

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💛 - Coveralls