[fallintoplace]

What

Write long printable ASCII runs of textproto byte fields in one call.

Why

escape_bytes currently writes printable bytes one at a time.

Implementation

• Batch the initial printable run when it is at least 32 bytes.
• Keep the existing escaping loop for the rest.
• Cover thresholds, control bytes, octal escapes, and mixed input.

Benchmark

Criterion release benchmark on Ubuntu x86-64, AMD EPYC 9V45, Rust 1.95. It reuses a capacity-reserved String. Lower is better.

Input	Before	After	Speedup
Plain 16 B	11.282 ns	11.466 ns	0.98x
Plain 64 B	51.279 ns	21.258 ns	2.41x
Plain 256 B	177.27 ns	93.047 ns	1.91x
Plain 4 KiB	2.6838 µs	1.2865 µs	2.09x
Plain 64 KiB	44.213 µs	20.953 µs	2.11x
Mixed 4 KiB	2.6748 µs	1.6345 µs	1.64x
Binary 4 KiB	6.8575 µs	6.5090 µs	1.05x
Escaped 256 B	178.15 ns	170.60 ns	1.04x

The 16 B and escaped cases were not statistically significant. The final commit only changes an equivalent Clippy range check from the measured implementation. Benchmark output.

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