dx, dy, dz use int values rather than float.

When using the command selectors "dx", "dy" and "dz" in Minecraft Bedrock Edition, their values must be an integer. A float value would result in a syntax error. This is not coherant with Java Edition, but is hugely significant when defining volumes for commands to run.

Steps to reproduce:

1. Open a world with commands enabled.

2. Run command /say @a[y=0,dy=5000.5]

Observation:

A syntax error is given:

Syntax error: Unexpected "5000.5": at "@a[y=0,dy=>>5000.5<<]"

Expected result:

The player is recognised by the identifier and thus their name is given in chat.