Fatal error on integer-value segments for Encoder

[konovalovk]

First of all, many thanks for your efforts!
Better to drop argument type for Encoder::escapeValue as compatibility is broken when the source array contains integers.

private function escapeValue( >>string<< &$str): string
Fatal error: Uncaught TypeError: Argument 1 passed to EDI\Encoder::escapeValue() must be of the type string, integer given

[sabas]

You're right!
Would you like to provide a pull request?

cc @voku

[voku]

@konovalovk can you provide a example, thanks!

PS: here is a possible fix but it needs a real world example for the tests: voku@a25a74d