I've been trying to fix the bug #3441722 and I have few questions. I've stored descriptions in /libraries/data_mysql.inc.php:

$cfg['ColumnTypesDescription'] = !empty($cfg['ColumnTypesDescription'])
    ? $cfg['ColumnTypesDescription']
    : array(
        'TINYINT' => 'A very small integer. The signed range is -128 to 127. The unsigned range is 0 to 255.',
        'SMALLINT' => 'A small integer. The signed range is -32768 to 32767. The unsigned range is 0 to 65535.',
        'MEDIUMINT' => 'A medium-sized integer. The signed range is -8388608 to 8388607. The unsigned range is 0 to 16777215.',
        'INT' => 'A normal-size integer. The signed range is -2147483648 to 2147483647. The unsigned range is 0 to 4294967295.',
        'BIGINT' => 'A large integer. The signed range is -9223372036854775808 to 9223372036854775807. The unsigned range is 0 to 18446744073709551615.',
        'DECIMAL' => 'A packed "exact" fixed-point number. M is the total number of digits (the precision) and D is the number of digits after the decimal point (the scale). The decimal point and (for negative numbers) the "-" sign are not counted in M. If D is 0, values have no decimal point or fractional part. The maximum number of digits (M) for DECIMAL is 65. The maximum number of supported decimals (D) is 30. If D is omitted, the default is 0. If M is omitted, the default is 10.',
        'FLOAT' => 'A small (single-precision) floating-point number. Permissible values are -3.402823466E+38 to -1.175494351E-38, 0, and 1.175494351E-38 to 3.402823466E+38. These are the theoretical limits, based on the IEEE standard. The actual range might be slightly smaller depending on your hardware or operating system.',
// ....

I don't think these description should be there, but I don't know the "right" place. Maybe we should create a database table or a file to store these information. I've implemented some code to fix this bug and it's working, maybe I should do a pull request.

I am pretty new to PhpMyAdmin's codebase.

Thank you very much and sorry about my english.