Issue #3254077: Exception: Serialization of 'Closure' is not allowed in serialize()

added 10 commits

• 45fff53a...b0267f64 - 7 commits from branch project:3.0.x
• 5c80aeb7 - Merge branch '3.0.x' into 3254077-exception-serialization-of
• 51970566 - Added test coverage.
• cad48bd7 - Also exclude httpClient property.

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added 1 commit

• 5e3c4fee - Fixed php error in HttpClientTrait.

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added 2 commits

• 03bf7454 - 1 commit from branch project:3.0.x
• 6ee0d0b0 - Merge branch markdown:3.0.x into 3254077-exception-serialization-of

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