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Unit::parse took one level of recursion per + - * / sign, so a text such as "1+1+...+1" with 200,000 terms overflowed the stack and aborted the process. Every number field, parse_number and every command parameter read as a length went through it. Text with more than 128 + - * / signs now reads as nothing; text with 128 or fewer reads as before. docs/mcp.md states the limit for length strings. The test a_very_long_expression_reads_as_nothing aborted with a stack overflow before the change.