Recursively get cached placeholders.

Closes #3513928

added 49 commits

• 460f4ec2...35c6af82 - 48 commits from branch project:11.x
• c560a180 - Recursively get cached placeholders.

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added 1 commit

• bac80a95 - Private and improve docs.

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resolved all threads

added 7 commits

• bac80a95...a0a7640c - 5 commits from branch project:11.x
• 805b0572 - Recursively get cached placeholders.
• 50f1deb3 - Private and improve docs.

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added 2 commits

• f8ad4c8c - Add explanatory comment.
• aed6b699 - Update assertions.

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added 172 commits

• aed6b699...98ed7a64 - 168 commits from branch project:11.x
• 2d6e0912 - Recursively get cached placeholders.
• d451061c - Private and improve docs.
• 47ca5cae - Add explanatory comment.
• 41a492c7 - Update assertions.

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closed