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Documentation wrote:Multi-dimensional assignments such as table[a, b, c, d] := value are handled as follows:

• If there is only one key remaining, perform the assignment and return. Otherwise:
• Search the object for the first key in the list.
• If a non-object is found, fail.
• If an object is not found, create one and store it.
• Recursively invoke the sub-object, passing the remaining keys and value - repeat from the top.

class baseObj {
	__Get(params*) {
		OutputDebug, "  Get():"
		for each, param in params
			OutputDebug, % "    p[" each "] = " param
		
	}
	__Set(params*) {
		OutputDebug, "  Set():"
		for each, param in params
			OutputDebug, % "    p[" each "] = " param
		ObjInsert(this, params[1], {base: baseObj})
	}
	__Call(params*) {
		OutputDebug, "  Call():"
		for each, param in params
			OutputDebug, % "    p[" each "] = " param
	}
}
;~ a := {base: baseObj}
;~ ;a.b[c] => a["b", c]
;~ a.b := {}
;~ a["b", c] := 4
	;~ ; no meta-function is called

a := {base: baseObj}
;a.b[c] => a["b", c]
a.b := {base: baseObj}
a["b", c] := 4
	; __Set called with two parameters: c and 4

• Recursively invoke the sub-object, passing the remaining keys and value - repeat from the top.

If a.b _contains_ an object, shouldn't __Set() be invoked on a.b?

Meta-functions are methods defined by an object's base which can define exactly how the object should act when an unknown key is requested.
Source: Objects