bigIncrements 和 increments 区别？

$table->bigIncrements('id'); = Auto-incrementing UNSIGNED BIGINT (primary key) 
$table->increments('id'); = Auto-incrementing UNSIGNED INTEGER (primary key)

INT

• The range of INT (signed) is -2147483648 to 2147483647.
• The range of INT (unsigned) is 0 to 4294967295.

BIGINT

• The BIGINT (signed) range is -9223372036854775808 to 9223372036854775807.
• BIGINT (unsigned) ranges from 0 to 18446744073709551615.