Loader must throw an error on zero-indentation block scalar

[dervus]

Now it doesn't and consumes rest of the input as valid part of block scalar.

[Jah-yee]

PR Available ✨

PR #744 addresses this exact issue. Here's a summary of the fix:

Problem: The loader silently accepts zero-indentation block scalars (which are ambiguous and invalid per YAML spec), leading to unexpected behavior.

Solution: Added a validation check that throws a descriptive error when a block scalar marker (| or >) is followed by a line with no indentation.

Changes:

• Added a check for indentation before processing block scalars
• Error message clearly explains the problem
• Only 1 commit, minimal diff

The PR is currently open at: #744

Would appreciate a review! 🙏

[Jah-yee]

PR Available

PR #744 addresses this issue about zero-indentation block scalars.

Problem: Zero-indentation block scalars (| or > followed by unindented content) are ambiguous/invalid per YAML spec.

Solution: Added validation to throw a descriptive error in this case.

PR: #744

Would appreciate a review! 🙏

[puzrin]

Reopen since PR reverted