--------
listing keys up to LTE: 'a~' <Buffer 61 7e>
'a'
'abcdef'
--------
listing keys up to LTE: 'aÿ' <Buffer 61 c3 bf>
'a'
'abcdef'
'aäöü'
--------
listing keys up to LTE: 'a￿' <Buffer 61 ef bf bf>
'a'
'abcdef'
'aäöü'
'aΔ'
'a中'
--------
listing keys up to LTE: <Buffer 61 ff> <Buffer 61 ff>
'a'
'abcdef'
'aäöü'
'aΔ'
'a中'
'a𠁩'
--------