start:
[1, 'as''d', [1, 2, function('strlen')], {'a': 1}]
{'a': 1}
1
Vim(put):E684: 
101101
{'1': 'asd', 'b': [1, 2, function('strlen')], '-1': {'a': 1}}asd
['-1', '1', 'b']
['asd', [1, 2, function('strlen')], {'a': 1}]
1:'asd'
b:[1, 2, function('strlen')]
-1:{'a': 1}
Vim(call):E737: 3
{'c': 'ccc', '1': 99, 'b': [1, 2, function('strlen')], '3': 33, '-1': {'a': 1}}
{'c': 'ccc', '1': 99, '3': 33, '-1': {'a': 1}}
101101
Vim(let):E706: d
Vim(let):E706: l
[1, 'as''d', {'a': 1}]
[4]
{'1': 99, '3': 33}
30000 29900 29001 16000 15001
Vim(let):E716: 15000
NONE 29999
33=999
{'33': 999}
len: 3
again: 3
Vim(call):E725: 
a:function('2')
Vim(let):E698: