terminology

[NAKsir-melody]

Right, we should use whatever notation is most Pythonic! :)
I think in Python a fixed-size list is called a "tuple".

I don't care either way. Implementations can use whatever terminology works best. For example, the natural terminology for Go is "array" (instead of tuple) and "slice" (instead of list). Notice that in Python lists also allow heterogeneous types

[NAKsir-melody]

• container: ordered heterogenous collection of values
  key-pair curly bracket notation {}, e.g. {"foo": "uint64", "bar": "bool"}
• vector: ordered fixed-length homogeneous collection of values
  angle bracket notation [type, N], e.g. ["uint64", N]
• list: ordered variable-length homogenous collection of values
  angle bracket notation [type], e.g. ["uint64"]

SSZ type definition

SSZ spec.	Element Length	Type Length	collection
vector	fixed	fixed	homogeneous
vector	fixed	variable	homogeneous
List	variable	fixed	homogeneous
List	variable	variable	homogeneous
Container	variable	variable	heterogenous

Related types of language

Language	List	Vector	Container
Python	list	list tuple(not modifiable) dequeue(with maxlen)	list tuple(not modifiable)
Golang	slice	array	array( interface)
C++ STL	vector	array	Vector(void*)