in src/main/java/org/apache/commons/csv/Lexer.java [512:520]
void trimTrailingSpaces(final StringBuilder buffer) {
int length = buffer.length();
while (length > 0 && Character.isWhitespace(buffer.charAt(length - 1))) {
length--;
}
if (length != buffer.length()) {
buffer.setLength(length);
}
}