TIL: strings.Split returns [""] if s does not contain sep and sep is not empty 😅

```
package main

import (
"fmt"
"strings"
)

func main() {
fmt.Printf("%q\n", strings.Split("", ","))
}
```

Split returns a slice of length 1 whose only element is s:

[""]

Old but still worth to read about why one shouldn;t defer Close() on writable files:

https://www.joeshaw.org/dont-defer-close-on-writable-files/

TIL: a % 128 = 0 is the same as a & 127 = 0

'Which is a faster operation since it just requires doing the AND and not the whole division and remainder comparison' @jesusvazquezp

from https://github.com/prometheus/prometheus/pull/14118#pullrequestreview-2068077407

GitHub

Check context every 128 labels instead of 100 by colega · Pull Request #14118 · prometheus/prometheus

Follow up on #14096 As promised, I bring a benchmark, which shows a very small improvement if context is checked every 128 iterations of label instead of every 100. It's much easier for a compu...

proposal: reflect: add TypeAssert likely accepted ? ')

https://github.com/golang/go/issues/62121

GitHub

proposal: reflect: add TypeAssert · Issue #62121 · golang/go

Consider the following benchmark: func Benchmark(b *testing.B) { v := reflect.ValueOf(new(time.Time)).Elem() b.ReportAllocs() for i := 0; i < b.N; i++ { \_ = v.Interface().(time.Time) } } This cu...