/give doesn't allow names to have spaces

when using /give the command

/give @p minecraft:paper[minecraft:custom_name="ab"]

works but

/give @p minecraft:paper[minecraft:custom_name="a b"]

does not work with the following error being produced:

I think the command should allow spaces and some other characters so you can have an item display "Atom's Hammer" or something similar

same should also apply to "minecraft:item_name"