🐛Fix $SUBSTR macro (ampproject#22443)

Fix story render service in prerendering. (ampproject#22346)

Add dirtyBit support to stored consent value (ampproject#22257)

* add dirtyBit support

* fix unit tests

* introduce consentStateValue to replace consentState

* use form

Revert "♻️Move VariableService to doc level (ampproject#22137)" (ampp…

…roject#22218)

This reverts commit 54afc8c.

Added the inabox experiment to the prod config (ampproject#22118)

🐛 fixed-layer: Fix hidden observer init in PWA (ampproject#21976)

* 🐛 fixed-layer: Fix hidden observer init in PWA

Hidden observer fails to init in PWAs because document is assumed
instead of allowing for the possibility of document or shadowRoot. Add
fallbacks for shadowRoot.

Fixes ampproject#21975

* fixed-layer: Simplify doc retrieval

📖 amp-facebook-comments: Document enforced max `numposts` (ampproject…

…#22068)

Closes ampproject#22062

Issue 22022 fix (ampproject#22023)

* return  fetch promise

* tests

* lint

Inabox host script disallows write action (expanding iframe, etc.) by…

… default. (ampproject#21762)

* Inabox: Host script disallows write action (expanding iframe, etc.) by default.

* Respect the whitelist fully instead of implicitly allowing send-positions

* lint

🐛 Replace internal version with compile time constant (ampproject#21832)

* Replace internal version with compile time constant

This implements a compile time constant replacement for the AMP Version magic string. This also fixes the last remaining issue with sourcemaps, caused by the old string replace not keeping the same number of chars in the replacement.

```js
// input
import {version} from './internal-version';
version();

// output
"1904010000000"
```

* Clean up nit