Strict value type check for checkboxes makes filling fields from tables difficult

The strict check added in #102 requires checkboxes to be set with boolean values only.

That makes it difficult to fill forms from Gherkin tables, since there is – to my knowledge – no built-in type conversion, and one cannot simply forward all values to MinkContext::fillFields anymore.

https://github.com/FriendsOfBehat/MinkExtension/blob/a9653d777beeb1dca4931a673c6a54bb2dd6ddf8/src/Behat/MinkExtension/Context/MinkContext.php#L142

Example:

    And I fill in the following:
      | Published                         | 1                  |
      | Name                              | Behat meet-up test |

I am not sure which is the right way to address it... Relax the requirement here? Detect checkbox types in MinkContext and cast the value appropriately? Not use the "fill in the following" step definition for checkboxes anymore?

Technically, this testsuite here did not change anything directly breaking the old code, but it triggered downstream changes like https://gitlab.com/behat-chrome/chrome-mink-driver/-/issues/158 that cause the issue.

Start by examining MinkContext::fillFields at the linked line and the strict checkbox validation introduced in #102. Reproduce the Gherkin table example with Published set to 1, then establish and test the intended behavior for table-supplied checkbox values without weakening the direct boolean check.