Fix is-int and is-float; add tests

src/main/eo/org/eolang/math/number.eo

@@ -39,10 +39,10 @@
   [] > is-int
     ^.n > value!
     if. > @
-      value.eq 0
+      ^.is-int-zero
       TRUE
       if.
-        value.eq 0.0
+        ^.is-float-zero
         FALSE
         eq.
           div.
@@ -55,17 +55,38 @@
   [] > is-float
     ^.n > value!
     if. > @
-      value.eq 0.0
+      ^.is-float-zero
       TRUE
       if.
-        value.eq 0
+        ^.is-int-zero
         FALSE
         eq.
           div.
             value
             value
           1.0
 
+  # Checking if number is integer 0
+  [] > is-int-zero
+    ^.n > value!
+    eq. > @
+      value.as-bytes
+      value.neg.as-bytes
+
+  # Checking if number is floatint point 0.0 or -0.0
+  [] > is-float-zero
+    ^.n > value!
+    if. > @
+      eq.
+        value.as-bytes
+        0.0.as-bytes
+      eq.
+        value.neg.as-bytes
+        -0.0.as-bytes
+      eq.
+        value.neg.as-bytes
+        0.0.as-bytes
+
   # Checking if number is NaN
   [] > is-nan
     not. > @

src/test/eo/org/eolang/math/number-tests.eo

@@ -57,6 +57,90 @@
     $.equal-to FALSE
     "check is nan of not nan"
 
+[] > check-is-float-zero-of-float-zero
+  assert-that > @
+    (number 0.0).is-float-zero
+    $.equal-to TRUE
+    "check is float zero of float zero"
+
+[] > check-is-float-zero-of-float-neg-zero
+  assert-that > @
+    (number -0.0).is-float-zero
+    $.equal-to TRUE
+    "check is float zero of float negative zero"
+
+[] > check-is-float-zero-of-positive-float
+  assert-that > @
+    (number 4.26).is-float-zero
+    $.equal-to FALSE
+    "check is float zero of positive float"
+
+[] > check-is-float-zero-of-negative-float
+  assert-that > @
+    (number -2.07).is-float-zero
+    $.equal-to FALSE
+    "check is float zero of negative float"
+
+[] > check-is-float-zero-of-int-zero
+  assert-that > @
+    (number 0).is-float-zero
+    $.equal-to FALSE
+    "check is float zero of int zero"
+
+[] > check-is-float-zero-of-positive-int
+  assert-that > @
+    (number 414).is-float-zero
+    $.equal-to FALSE
+    "check is float zero of positive int"
+
+[] > check-is-float-zero-of-negative-int
+  assert-that > @
+    (number -201).is-float-zero
+    $.equal-to FALSE
+    "check is float zero of negative int"
+
+[] > check-is-int-zero-of-float-zero
+  assert-that > @
+    (number 0.0).is-int-zero
+    $.equal-to FALSE
+    "check is int zero of float zero"
+
+[] > check-is-int-zero-of-float-neg-zero
+  assert-that > @
+    (number -0.0).is-int-zero
+    $.equal-to FALSE
+    "check is int zero of float negative zero"
+
+[] > check-is-int-zero-of-positive-float
+  assert-that > @
+    (number 4.26).is-int-zero
+    $.equal-to FALSE
+    "check is int zero of positive float"
+
+[] > check-is-int-zero-of-negative-float
+  assert-that > @
+    (number -2.07).is-int-zero
+    $.equal-to FALSE
+    "check is int zero of negative float"
+
+[] > check-is-int-zero-of-int-zero
+  assert-that > @
+    (number 0).is-int-zero
+    $.equal-to TRUE
+    "check is int zero of int zero"
+
+[] > check-is-int-zero-of-positive-int
+  assert-that > @
+    (number 414).is-int-zero
+    $.equal-to FALSE
+    "check is int zero of positive int"
+
+[] > check-is-int-zero-of-negative-int
+  assert-that > @
+    (number -201).is-int-zero
+    $.equal-to FALSE
+    "check is int zero of negative int"
+
 [] > check-is-int-of-int-zero
   assert-that > @
     (number 0).is-int
@@ -81,6 +165,18 @@
     $.equal-to TRUE
     "check is-float of float zero"
 
+[] > check-is-float-of-float-neg-zero
+  assert-that > @
+    (number -0.0).is-float
+    $.equal-to TRUE
+    "check is-float of float negative zero"
+
+[] > check-is-int-of-float-neg-zero
+  assert-that > @
+    (number -0.0).is-int
+    $.equal-to FALSE
+    "check is-int of float negative zero"
+
 [] > check-is-int-positive-float
   assert-that > @
     (number 123.35).is-int