Custom resources math

🏫 Restricted math grammar for young learners

By default the math engine recognizes the full range of mathematical notation. A custom grammar narrows that scope — here, only digits 0–9 and the operators + and − are accepted. Anything else is ignored.

This is useful for educational apps targeting young students: the engine won't misinterpret a shaky digit as a Greek letter or a fraction.

The grammar is passed inline via customGrammarContent — no server upload needed (contrast with customResources, which references a pre-uploaded file).

Try writing 3 + 5 or 12 - 4. Complex symbols like ∫ or √ will not be recognized.