The magic data for TreeDBM differs from description

[VanyaBelyaev]

I am starting using tkrzw for my project project, and I've observed that for tkrzw 1.03.2 the actual structure of the TreeDBM file differs
form the descrition, in particlular the "magic data" corresponds to those expected for HashDBM

Simple check/reproducer

import tkrzw, io

open_params = {
    "concurrent" : True  ,
    "truncate"   : False ,
}

filename = 'QUQU1'

# Prepares the database.
dbm = tkrzw.DBM()

dbm.Open(filename, True, dbm = 'TreeDBM' , **open_params )

aaa = dbm.Inspect()
print ( 'DBTYPE' , aaa['class'] )
dbm [ "first"  ] = "hop"
dbm.Close()

with io.open ( filename  ,'rb' ) as f : s16 = f.read(16)

print ( 'MAGIC9:' , s16[:9] )

it produces the output L

DBTYPE TreeDBM
MAGIC9: b'TkrzwHDB\n'

However according to https://dbmx.net/tkrzw/#treedbm_format
the first four bytes must be TDB\0