Summary by cubic

Fixes the boundary length error message in formDataToStream to say “1–70” instead of “10–70,” matching the actual validation. No behavior changes, only clearer feedback.

Description

• Change thrown error text to “1–70” to match the existing check (<1 or >70).
• No logic or API changes.

Docs, Testing, Versioning

• Docs: If any docs mention the boundary range, update /docs/ to “1–70”.
• Testing: No new tests. Update assertions only if they check this exact message.
• Semantic version impact: Patch.

^{Written for commit d4e8435. Summary will update on new commits.}