chore: fix linting issues

Author: ernado

.golangci.yml

@@ -1,6 +1,4 @@
 linters-settings:
-  govet:
-    check-shadowing: true
   gocyclo:
     min-complexity: 15
   maligned:
@@ -16,6 +14,10 @@ linters-settings:
     line-length: 140
   goimports:
     local-prefixes: github.com/go-faster/
+  revive:
+    rules:
+      - disabled: true
+        name: unused-parameter
   gocritic:
     enabled-tags:
       - diagnostic
@@ -101,3 +103,7 @@ issues:
     # Ignore linters in main packages.
     - path: main\.go
       linters: [goconst, funlen, gocognit, gocyclo]
+
+    # Too much false-positives.
+    - linters: [gosec]
+      text: G115

dec_read.go

@@ -120,16 +120,16 @@ func (d *Decoder) read() error {
 	return nil
 }
 
-func (d *Decoder) readAtLeast(min int) error {
+func (d *Decoder) readAtLeast(n int) error {
 	if d.reader == nil {
 		d.head = d.tail
 		return io.ErrUnexpectedEOF
 	}
 
-	if need := min - len(d.buf); need > 0 {
+	if need := n - len(d.buf); need > 0 {
 		d.buf = append(d.buf, make([]byte, need)...)
 	}
-	n, err := io.ReadAtLeast(d.reader, d.buf, min)
+	n, err := io.ReadAtLeast(d.reader, d.buf, n)
 	if err != nil {
 		if err == io.EOF && n == 0 {
 			return io.ErrUnexpectedEOF

num.go

@@ -135,15 +135,15 @@ func (n Num) Format(f fmt.State, verb rune) {
 	case 'd':
 		d, err := n.Int64()
 		if err != nil {
-			fmt.Fprintf(f, "%%!invalid(Num=%s)", n.String())
+			_, _ = fmt.Fprintf(f, "%%!invalid(Num=%s)", n.String())
 			return
 		}
 		v := big.NewInt(d)
 		v.Format(f, verb)
 	case 'f':
 		d, err := n.Float64()
 		if err != nil {
-			fmt.Fprintf(f, "%%!invalid(Num=%s)", n.String())
+			_, _ = fmt.Fprintf(f, "%%!invalid(Num=%s)", n.String())
 			return
 		}
 		v := big.NewFloat(d)

tools/mkint/main.go

@@ -23,8 +23,8 @@ type IntType struct {
 	DecoderIterations int // ceil(log10 (max value))
 }
 
-func defineIntType(name string, max uint64) IntType {
-	formattedLen := len(strconv.FormatUint(max, 10))
+func defineIntType(name string, maxN uint64) IntType {
+	formattedLen := len(strconv.FormatUint(maxN, 10))
 	decoderIters := formattedLen
 
 	const decoderItersLimit = 10 - 1