Clarifying:

These are clarifications and improvements to the specification which in many cases make ambiguous sections more explicit. GraphQL service libraries should check to ensure their behavior matches the specifiction.

• [c9b6827] Better explanation of interpreting escape sequences in strings.
• [f42dab5] Explain when build-in scalars can be omitted from a schema.
• [79caa41] Use U+1234 instead of 0x1234 to refer to unicode code points.
• [#221] Adds full algorithm definitions for Execution.
• [#219] Ensure | is included as a possible Punctuator.
• [#213] Clarify how to coerce null for List types.
• [#177] Fix issue with value completion for objects with sub-selections.
• [0599414] Object and Interfaces must declare at least one field.
• [7c36326] Removed reference to experimental subscriptions feature.

Note: Many grammar and consistency commits were provided by the community, but only changes notable for their clarification of ambiguity were listed.