.arr.explode() fails to raise error for non-Array inputs

[cmdlineluser]

Checks

• I have checked that this issue has not already been reported.
• I have confirmed this bug exists on the latest version of Polars.

Reproducible example

import polars as pl

df = pl.DataFrame({"a": [[1, 2, 3]]})

df.select(pl.col.a.arr.explode())
# shape: (3, 1)
# ┌─────┐
# │ a   │
# │ --- │
# │ i64 │
# ╞═════╡
# │ 1   │
# │ 2   │
# │ 3   │
# └─────┘

Log output

No response

Issue description

Update: Perhaps a better example is using string inputs:

pl.DataFrame({"a": ["one"]}).select(pl.col.a.arr.explode())
# shape: (1, 1)
# ┌─────┐
# │ a   │
# │ --- │
# │ str │
# ╞═════╡
# │ one │
# └─────┘

Other methods error as expected:

df.select(pl.col.a.arr.to_struct())

# InvalidOperationError: expected Array type, got: list[i64]
# 
# Resolved plan until failure:
# 
# 	---> FAILED HERE RESOLVING 'select' <---
# DF ["a"]; PROJECT */1 COLUMNS; SELECTION: None

Expected behavior

InvalidOperationError

Installed versions

main

[barak1412]

@orlp
May you please clear @ritchie46 comment here #19115?

[orlp]

@barak1412 I don't understand what you're asking.

[barak1412]

@orlp thanks, @ritchie46 answered me

[barak1412]

@orlp May you please assign me? I hope I will open PR today evening.