Bug: isinstance with tuple of types produces incorrect output

[swernerx]

Description

When using isinstance() with a tuple of types (common Python pattern), the output is incorrect.

Python Input

if isinstance(obj, (list, tuple, dict)):
    pass

Current Output (v1.3.1)

if (isinstance(obj, tuple(list, tuple, dict))) {
}

Problem

tuple(list, tuple, dict) calls the tuple function with three arguments, which is wrong. The Python tuple here is just a literal grouping of types.

Expected Output (Option A - Direct translation)

if (isinstance(obj, [list, tuple, dict])) {
}

Expected Output (Option B - Native JS)

if (Array.isArray(obj) || obj instanceof Set || obj instanceof Map) {
}

Test Case

# Multiple type check
isinstance(x, (int, float, complex))

# Single type check (works correctly)
isinstance(x, int)

Priority

🟡 Medium - Common pattern in Python code

[swernerx]

Fixed in the latest commit. The isinstance function now handles tuple of types correctly:

isinstance(obj, (list, tuple, dict))

Now correctly transpiles to:

isinstance(obj, [list, tuple, dict])

The runtime's isinstance function was also updated to support arrays of types.