Fix String::is_valid_integer() for single symbols + and -
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@ -3491,7 +3491,7 @@ bool String::is_valid_integer() const {
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return false;
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int from=0;
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if (operator[](0)=='+' || operator[](0)=='-')
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if (len!=1 && (operator[](0)=='+' || operator[](0)=='-'))
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from++;
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for(int i=from;i<len;i++) {
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