oneOf alters input value affecting validation on subsequent subschemas when type coercion is enabled

[DannyvdSluijs]

As pointed out by @madman-81 in #770 and confirmed in #770 (comment) the oneOf alters the data when type coercion is enabled which ultimatly is correct. However the altered version of $value is passed to the subsequent subschemas that are part of the oneOf this can cause failing validation while with the original inputted $value it might validate.

This can be reproduced by the following:

<?php

namespace Tests\Unit\Validation;

use JsonSchema\Constraints\Constraint;
use JsonSchema\Validator;
use PHPUnit\Framework\TestCase;

class JsonValidateV6Test extends TestCase
{
    public function testJsonCompare()
    {
        $schema = <<<JSON
            {
                "title": "Location",
                "type": "object",
                "properties": {
                    "id": {
                        "type": "string"
                    },
                    "related_locations": {
                        "oneOf": [
                            {
                                "type": "null"
                            },
                            {
                                "type": "array",
                                "items": {
                                    "type": "object",
                                    "properties": {
                                        "latitude": {
                                            "type": "string"
                                        },
                                        "longitude": {
                                            "type": "string"
                                        }
                                    }
                                }
                            }
                        ]
                    }
                }
            }
        JSON;

        $json = <<<JSON
            {
                "id": "LOC1",
                "related_locations": [
                    {
                        "latitude": "51.047598",
                        "longitude": "3.729943"
                    }
                ]
            }
        JSON;

        $jsonObj = json_decode($json);
        $schemaObj = json_decode($schema);

        $jsonSchemaValidation = new Validator();
        $jsonSchemaValidation->validate($jsonObj, $schemaObj, Constraint::CHECK_MODE_COERCE_TYPES);

        $this->assertTrue($jsonSchemaValidation->isValid());
    }
}