godot: Decimals() is not functioning properly

Godot version: 3.0.6.stable.official.8314054

OS/device including version: Windows 10

Issue description: The function Decimals returns 0 even when I have a decimal number.

information in Godot’s API reference:

    float decimals ( float step )
    Returns the position of the first non-zero digit, after the decimal point.
    # n is 2
    n = decimals(0.035)

Steps to reproduce: code used:

func _ready():
        var temp_wind = 0
        randomize()
        wind_speed = round(rand_range(50, 100)) #get a rounded number between 50 and 100
	temp_wind = wind_speed / 2 #divide by 2, so all odd numbers should have 1 decimal now
	if decimals(temp_wind) == 0:
	wind_speed = -wind_speed  #is always called even if temp_wind is an x.5 value

Minimal reproduction project: Debug Project.zip

In order to easily reproduce just relaunch project over and over untill you get an odd value, or just assign wind_speed directly with a non random odd number. In the debug project I’ve made sure to print the result in the debug window yielding:

running cmdline: "C:\Program Files (x86)\Steam\steamapps\common\Godot Engine\godot.windows.opt.tools.64.exe" "--path" "C:/games/Projects/Debug%20Project" "--remote-debug" "127.0.0.1:6007" "--allow_focus_steal_pid" "396" "--position" "448,240" "res://scene.tscn"
** Debug Process Started **
OpenGL ES 3.0 Renderer: GeForce GTX 960/PCIe/SSE2
**25.5 contains no decimals**
** Debug Process Stopped **

I hope this information suffices to look into the issue.

Thanks in advance!