Change record status: 
Project: 
Introduced in branch: 
10.3.x
Introduced in version: 
10.3.0
Description: 

\Drupal\Component\Assertion\Inspector::assertTraversable is deprecated in 10.3.0 and removed in 11.0.0. Use is_iterable instead.

Before:

if (Inspector::assertTraversable($traversable)) {
  // ...
}

After:

if (is_iterable($traversable)) {
  // ...
}
Impacts: 
Module developers