fix: ensure that we properly unpack a tuple in string formatting

[beckermr]

This fixes a bug in printing object's reprs after vmapping them.

[codspeed-hq]

Merging this PR will not alter performance

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

✅ 36 untouched benchmarks

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_{Comparing fix-repr (9f9d6c3) with main (b5d0bdb)}